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{{Article summary start}}
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{{Related articles start}}
{{Article summary text|For users on Linux and Unix, KDE offers a full suite of user workspace applications which allow interaction with these operating systems in a modern, graphical user interface. This article covers its installation, configuration, and troubleshooting.}}
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{{Related|Desktop environment}}
{{Article summary text|KDE uses the [[Qt]] toolkit.}}
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{{Related|Display manager}}
{{Article summary heading|Overview}}
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{{Related|Dolphin}}
{{Article summary text|{{Graphical user interface overview}}}}
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{{Related|Window manager}}
{{Article summary heading|Related}}
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{{Related|Qt}}
{{Article summary wiki|Plasma}}
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{{Related|KDM}}
{{Article summary wiki|Qt}}
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{{Related|KDevelop}}
{{Article summary wiki|KDM}}
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{{Related|Trinity}}
{{Article summary wiki|KDevelop 4}}
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{{Related|Uniform Look for Qt and GTK Applications}}
{{Article summary wiki|Uniform Look for Qt and GTK Applications}}
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{{Related articles end}}
{{Article summary end}}
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From [http://www.kde.org/community/whatiskde/softwarecompilation.php KDE - KDE Software Compilation]:
+
KDE is a software project currently comprising of a [[desktop environment]] known as Plasma (or Plasma Workspaces), a collection of libraries and frameworks (KDE Frameworks) and several applications (KDE Applications) as well. KDE upstream has a well maintained [http://userbase.kde.org/ UserBase wiki]. Detailed information about most KDE applications can be found there.
  
:''The KDE Software Compilation grew out of the history of the KDE Project. In its inception, KDE was formed to create a beautiful, functional and free desktop computing environment for Linux and similar operating systems. At the time, these systems lacked a graphical user environment that could rival the offerings from the larger proprietary operating system vendors. KDE was created to fill this gap.''
+
== Installation ==
  
:''The KDE Software Compilation is the set of libraries, workspaces, and applications produced by KDE that share this common heritage, and continue to use the synchronized release cycle. Software may move in and out of this semi-formally defined collection depending on the particular needs of the contributors who are working on that software, with exceptions made to ensure that binary compatibility remains at the library level throughout any major release of the compilation.''
+
=== Plasma Desktop ===
  
From [http://www.kde.org/download/ KDE - Getting KDE Software]:
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{{Note|
 +
*Plasma 5 is not co-installable with Plasma 4.
 +
*The Plasma 4 desktop is unmaintained since August 2015.[https://www.kde.org/announcements/announce-applications-15.08.0.php] It is no longer in the official repositories since December 2015.[https://www.archlinux.org/news/dropping-plasma-4/]
 +
* [[KDM]] is no longer available for Plasma 5. KDE upstream [http://blog.davidedmundson.co.uk/blog/display_managers_finale recommends] using the [[SDDM]] display manager as it provides integration with the Plasma 5 theme.}}
  
:''KDE software consists of a large number of individual applications and a desktop workspace as a shell to run these applications. You can run KDE applications just fine on any desktop environment. KDE applications are built to integrate well with your system's components. By using also KDE workspace, you get even better integration of your applications with the working environment while lowering system resource needs.''
+
Before installing Plasma, make sure you have a working [[Xorg]] installation on your system.
  
The KDE upstream has a well maintained [http://userbase.kde.org/ UserBase wiki]. Users can get detailed information about most KDE applications there.
+
Install the {{Pkg|plasma-meta}} meta-package or the {{Grp|plasma}} group. For differences between {{Pkg|plasma-meta}} and {{Grp|plasma}} reference [[Creating packages#Meta packages and groups]]. Alternatively, for a more minimal Plasma installation, install the {{Pkg|plasma-desktop}} package.
  
==Overview==
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=== Upgrading from Plasma 4 to 5 ===
'''KDE 4.10''' Software Compilation is the current major [[http://kde.org/announcements/ release of KDE]. Important hints for upgraders:
+
* Always check if your mirror is '''up to date'''.
+
* '''Do not force an update using pacman --force'''. If pacman complains about conflicts please '''file a bug report'''.
+
* You can remove the meta packages and the sub packages you do not need after the update.
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* If you do not like split packages just keep using the kde-meta packages.
+
  
==Installation==
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# Isolate {{ic|multi-user.target}}:{{bc|# systemctl isolate multi-user.target}}
KDE 4.x is '''modular'''. You can install an entire set of packages or only install your preferred KDE applications.
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# If you use KDM as display manager, [[disable]] the {{ic|kdm.service}} systemd unit.
 +
# [[Install|Uninstall]] the {{AUR|kdebase-workspace}} package.
 +
# [[Install]] the {{pkg|plasma-meta}} package or the {{grp|plasma}} group.
 +
# [[Enable]] the {{ic|sddm.service}} systemd unit, or install and enable any other [[display manager]].
 +
# Reboot or simply [[start]] the systemd {{ic|sddm.service}} unit.
 +
 +
{{Note|The Plasma 4 configuration is not automatically migrated to Plasma 5, so you will have to configure your desktop from scratch.}}
  
{{Note|If you do not have [[Xorg#Installation|Xorg]] installed on your system, be sure to install it before KDE.}}
+
=== KDE applications and language packs ===
  
=== Full install ===
+
To install the full set of KDE Applications, install the {{Grp|kde-applications}} group or the {{Pkg|kde-applications-meta}} meta-package. Note that this will only install applications, it will not install any version of the Plasma Desktop.
[[pacman|Install]] {{Grp|kde}} or {{Grp|kde-meta}} available in the [[official repositories]]. For differences between {{Grp|kde}} and {{Grp|kde-meta}} see the [[KDE Packages]] article.
+
  
=== Minimal install ===
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If you need language files, install {{ic|kde-l10n-'''yourlanguagehere'''}} (e.g. {{Pkg|kde-l10n-de}} for the German language). For a full list of available languages see [https://www.archlinux.org/packages/extra/any/kde-l10n/ this link].
If you want to have a minimal installation of the KDE SC, install:
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* {{Grp|kdebase}}
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* {{Pkg|phonon-vlc}} or {{Pkg|phonon-gstreamer}} as phonon backend
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* A {{ic|ttf-*}} font package such as {{Pkg|ttf-dejavu}}. For more information see {{Bug|26012}}.
+
  
=== Language pack ===
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== Starting Plasma ==
If you need language files, install {{ic|kde-l10n-yourlanguagehere}} (e.g. {{Pkg|kde-l10n-de}} for the German language).
+
  
For a full list of available languages see [https://www.archlinux.org/packages/extra/any/kde-l10n/ this link].
+
{{Tip|To better integrate SDDM with Plasma, it is recommended to edit {{ic|/etc/sddm.conf}} to use the breeze theme. Refer to [[SDDM#Theme settings]] for instructions.}}
  
==Starting KDE==
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To launch a Plasma 5 session, choose ''Plasma'' in your [[display manager]] menu.
  
Starting KDE depends on your preferences. Basically there are two ways of starting KDE. Using '''KDM''' or '''xinitrc'''.
+
Alternatively, to start Plasma with ''startx'', append {{ic|exec startkde}} to your {{ic|.xinitrc}} file. If you want to start Xorg at login, please see [[Start X at login]].
  
=== Using KDM (KDE Display Manager)===
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=== Wayland ===
  
''It is highly recommended to get familiar with the [[Display Manager|full article]] concerning display managers, before you make any changes. See also [[KDM]] Wiki page.''
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As of Plasma 5.6, Plasma on [[Wayland]] should be usable but still buggy.[https://blog.martin-graesslin.com/blog/2016/03/february-kwinwayland-update-all-about-input/] Multi-monitor support is broken.
  
[[Daemons|Enable/start]] {{ic|kdm.service}}.
+
* To start a Plasma on Wayland session from a display manager, install the {{Pkg|plasma-wayland-session}} package and ''Plasma'' should show up in the display manager.
 +
* To start a Plasma on Wayland session from a console, run {{ic|startplasmacompositor}}.
  
===Using xinitrc===
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== Configuration ==
''The meaning and usage of '''xinitrc''' is very well described [[Xinitrc|here]].
+
  
{{pkg|kdebase-workspace}} provides startkde. Make sure it is installed. Then edit {{ic|~/.xinitrc}}, uncomment:
+
Most settings for KDE applications are stored in {{ic|~/.config}}, but some older applications may use {{ic|~/.kde4}}. However, configuring KDE is primarily done through the '''System Settings''' application. It can be started from a terminal by executing ''systemsettings5''.
  exec startkde
+
  
After a reboot and/or log-in, each execution of Xorg ('''startx''' or '''xinit''') will start KDE automatically.
+
Frameworks 5 applications can use KDE 4 configuration however they expect the configuration files to be located in different places. To allow Frameworks 5 applications running in KDE 4 to share the same configurations they may be moved to the new locations and symlinked back to the old. Examples are:
 +
*Konsole profiles from {{ic|~/.kde4/share/apps/konsole}} to {{ic|~/.local/share/konsole/}}
 +
*Application appearance from {{ic|~/.kde4/share/config/kdeglobals}} to {{ic|~/.config/kdeglobals}}
  
{{Note| If you want to start Xorg at boot, please read [[Start X at Login]] article.}}
+
=== Personalization ===
  
==Configuration==
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==== Plasma desktop ====
{{Note| Configuring KDE is primarily done in ''''System Settings''''. There are also a few other options available for the desktop with ''''Default Desktop Settings'''' when you right click the desktop.}}
+
  
For other personalization options not covered below such as activities, different wallpapers on one cube, etc please refer to the [[Plasma]] wiki page.
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===== Themes =====
  
===Personalization===
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{{Note|1=If the Plasma cursor theme is incorrect in some instances, see the following [https://bbs.archlinux.org/viewtopic.php?pid=1533071#p1533071 forum post] for a workaround.}}
How to set up the KDE desktop to your personal style; use different Plasma themes, window decorations and icon themes.  
+
[http://kde-look.org/index.php?xcontentmode=76 Plasma themes] define the look of panels and plasmoids. For easy system-wide installation, some such themes are available in both the official repositories and the [https://aur.archlinux.org/packages.php?O=0&K=plasmatheme&do_Search=Go AUR].
  
====Plasma Desktop====
+
The easiest way to install themes is by going through the Desktop Settings control panel:
[[Plasma]] is a desktop integration technology that provides many functions from displaying the wallpaper, adding widgets to the desktop, and handling the panels or "taskbar".
+
  
=====Themes=====
+
  Workspace Theme > Desktop Theme > Get new Themes
[http://kde-look.org/index.php?xcontentmode=76 Plasma themes] can be installed through the Desktop Settings control panel. Plasma themes define how your panels and plasmoids look like. If you like to have them installed system-wide, themes can be found in both the official repositories and [https://aur.archlinux.org/packages.php?O=0&K=plasmatheme&do_Search=Go AUR].
+
  
=====Widgets=====
+
This will present a nice frontend for [http://www.kde-look.org/ kde-look.org] that allows you to install, uninstall, or update third-party plasmoid scripts with literally just one click.
Plasmoids are little scripted or coded KDE apps that enhance the functionality of your desktop. There are two kinds, plasmoid scripts and plasmoid binaries.
+
  
Plasmoid binaries must be installed using PKGBUILDS from [https://aur.archlinux.org/packages.php?O=0&K=plasmoid&do_Search=Go&PP=25&SO=d&SB=v AUR].  Or write your own PKGBUILD.
+
Splash and Lock screens are currently unavailable so to customize these screens you have to modify the original theme found in {{ic|/usr/share/plasma/look-and-feel/}}.
 +
See [https://www.kubuntuforums.net/showthread.php?67599-Plasma-5-background-images&s=59832dc20e5bfc2948dbb591d8453f61 this thread] on the Kubuntu forums.
  
The easiest way to install plasmoid scripts is by right-clicking onto a panel or the desktop:
+
Note that the [[SDDM]] login screen is not part of this theme.
  
Add Widgets -> Get new Widgets -> Download Widgets
+
====== Qt and GTK+ Applications Appearance ======
  
This will present a nice frontend for [http://www.kde-look.org/ kde-look.org] and allows you to (un)install or update third-party plasmoid scripts with just one click.
+
{{Tip|For Qt and GTK theme consistency, see [[Uniform look for Qt and GTK applications]].}}
  
Most plasmoids are not created officially by KDE developers.  You can also try installing Mac OS X widgets, Microsoft Windows Vista/7 widgets, Google Widgets, and even SuperKaramba widgets.
+
;Qt4
 +
For Qt4 applications to have a consistent appearance, there are two options:
 +
Install {{Pkg|breeze-kde4}} and then pick Breeze as GUI Style in {{ic|qtconfig-qt4}}; or install {{Pkg|breeze-gtk}} and pick GTK+ as GUI Style.
  
=====Sound applet in the System Tray=====
+
;GTK+
 +
The recommended theme for a pleasant appearance in GTK+ applications is {{Pkg|breeze-gtk}} or {{AUR|gnome-breeze-git}}, a GTK+ theme designed to mimic the appearance of Plasma 5 Breeze.
 +
Install {{Pkg|kde-gtk-config}} and select the installed GTK-theme for GTK2/GTK3-Theme in ''System Settings > Application Style > GNOME Application Style''.
  
Install Kmix ({{Pkg|kdemultimedia-kmix}}) from the official repositories and start it from the appliocation launcher. Since KDE autostarts programs from the previous session, the program need not be started manually every time one logs in.
+
In some themes, tooltips in GTK+ applications have white text on white backgrounds making it difficult to read. To change the colors in GTK2 applications, find the section for tooltips in the gtkrc file and change it. For GTK3 application two files need to be changed, gtk.css and settings.ini.
  
====Window Decorations====
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===== Widgets =====
[http://kde-look.org/index.php?xcontentmode=75 Window decorations] can be changed in
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System Settings -> Workspace Appearance -> Window Decorations
+
There you can also directly download and install more themes with one click and some are available on [https://aur.archlinux.org/packages.php?O=0&K=kdestyle&do_Search=Go&PP=25&SO=d&SB=v AUR].
+
  
====Icon Themes====
+
Plasmoids are little scripted (plasmoid scripts) or coded (plasmoid binaries) KDE applications designed to enhance the functionality of your desktop.
Not many full system icons themes are available for KDE 4.  You can open up '''System Settings > Application Appearance > Icons''' and browse for new ones or install them manually. Many of them can be found on [http://www.kde-look.org/ kde-look.org].
+
  
Official logos, icons, CD labels and other artwork for Arch Linux are provided in the {{Pkg|archlinux-artwork}} package.  After installing you can find such artwork at {{ic|/usr/share/archlinux/}}.
+
Plasmoid binaries can be installed using PKGBUILDs from [https://aur.archlinux.org/packages.php?O=0&K=plasmoid&do_Search=Go&PP=25&SO=d&SB=v AUR], or you can write your own PKGBUILD.
  
====Fonts====
+
The easiest way to install plasmoid scripts is by right-clicking onto a panel or the desktop and choosing ''Add Widgets > Get new Widgets > Download Widgets''.
===== Fonts in KDE look poor =====
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Try installing the {{Pkg|ttf-dejavu}} and {{Pkg|ttf-liberation}} packages.  
+
  
After the installation, be sure to log out and back in. You should not have to modify any settings in the "Fonts" panel of the KDE System Settings application.
+
This will present a nice frontend for [http://www.kde-look.org/ kde-look.org] that allows you to install, uninstall, or update third-party plasmoid scripts with literally just one click.
  
If you have personally set up how your [[Fonts]] render, be aware that System Settings may alter their appearance. When you go '''System Settings > Appearance > Fonts''' System Settings will likely alter your font configuration file ({{ic|fonts.conf}}).  
+
Most plasmoids are not created officially by KDE developers. You can also try installing Mac OS X widgets, Microsoft Windows Vista/7 widgets, Google Widgets, and even SuperKaramba widgets.
  
There is no way to prevent this but if you set the values to match your {{ic|fonts.conf}} file the expected font rendering will return (it will require you to restart your application or in a few cases for you to have to restart your desktop).
+
===== Sound applet in the system tray =====
  
Note too that Gnomes' Font Preferences will also do this if you use both desktop environments.
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[[Install]] {{Pkg|plasma-pa}} or {{Pkg|kmix}} (start Kmix from the Application Launcher).
  
===== Fonts are huge or seems disproportional =====
+
{{Note|1=To adjust the [https://bugs.kde.org/show_bug.cgi?id=313579#c28 step size of volume increments/decrements], add e.g. {{ic|1=VolumePercentageStep=1}} in the {{ic|[Global]}} section of {{ic|~/.kde4/share/config/kmixrc}}}}
Try to force fonts DPI to '''96''' on '''System Settings > Application Appearance > Fonts.'''
+
  
If it does not work try set DPI directly on Xorg configuration [[Xorg#Setting_DPI_manually|here]].
+
===== Disable panel shadow =====
  
====Space efficiency====
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As the plasma panel is on top of other windows, its shadow is drawn over them. [https://bbs.archlinux.org/viewtopic.php?pid=1228394#p1228394] To disable this behaviour without impacting other shadows, [[install]] {{Pkg|xorg-xprop}} and run:
  
Users with small screens (eg Netbooks) can change some setting to make KDE more space efficient. See [http://userbase.kde.org/KWin#Using_with_small_screens_(eg_Netbooks) upstream wiki] for more info. Also you can use [http://www.kde.org/workspaces/plasmanetbook/ KDE's Plasma Netbook] which is a workspace made specifically for small, lightweight netbook devices.
+
$ xprop -remove _KDE_NET_WM_SHADOW
  
=== Networking ===
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then select the panel with the plus-sized cursor. [https://forum.kde.org/viewtopic.php?f=285&t=121592] For automation, install {{Pkg|xorg-xwininfo}} and create the following script:
You can choose from the following tools:
+
 
* NetworkManager. See [[NetworkManager#KDE4|NetworkManager]] for more information.
+
{{hc|/usr/local/bin/kde-no-shadow|<nowiki>
* Wicd and its KDE front end {{AUR|wicd-kde}}. See [[Wicd]] for more information.
+
#!/bin/bash
 +
for WID in $(xwininfo -root -tree | sed '/"Plasma": ("plasmashell" "plasmashell")/!d; s/^  *\([^ ]*\) .*/\1/g'); do
 +
  xprop -id $WID -remove _KDE_NET_WM_SHADOW
 +
done
 +
</nowiki>}}
 +
 
 +
The script can be run on login with ''Add Script'' in ''Autostart'':
 +
 
 +
$ kcmshell5 autostart
 +
 
 +
==== Window decorations ====
 +
 
 +
[http://kde-look.org/index.php?xcontentmode=75 Window decorations] can be changed in ''System Settings > Workspace Appearance > Window Decorations''.
 +
 
 +
There you can also directly download and install more themes with one click, and some are available in the [https://aur.archlinux.org/packages.php?O=0&K=kdestyle&do_Search=Go&PP=25&SO=d&SB=v AUR].
 +
 
 +
==== Icon themes ====
 +
 
 +
Icon themes can be installed and changed on ''System Settings > Icons''.
 +
{{note|Although all modern Linux desktops share the same icon theme format, desktops like [[GNOME]] use fewer icons (esp. in menus and toolbars). Themes developed for such desktops usually lack icons required by Plasma 5 and KDE apps.<br/>
 +
It is recommended to install Plasma compatible icon themes instead.}}
 +
 
 +
==== Fonts ====
 +
 
 +
===== Fonts in a Plasma session look poor =====
 +
 
 +
Try installing the {{Pkg|ttf-dejavu}} and {{Pkg|ttf-liberation}} packages.
 +
 
 +
After the installation, be sure to log out and back in. You should not have to modify anything in ''System Settings > Fonts''.
 +
 
 +
If you have personally set up how your [[Fonts]] render, be aware that System Settings may alter their appearance. When you go ''System Settings > Appearance > Fonts'' System Settings will likely alter your font configuration file ({{ic|fonts.conf}}).
 +
 
 +
There is no way to prevent this, but, if you set the values to match your {{ic|fonts.conf}} file, the expected font rendering will return (it will require you to restart your application or in a few cases restart your desktop). Note that Gnome's Font Preferences also does this.
 +
 
 +
===== Fonts are huge or seem disproportional =====
 +
 
 +
Try to force font DPI to '''96''' in ''System Settings > Application Appearance > Fonts''.
 +
 
 +
If that does not work, try setting the DPI directly in your Xorg configuration as documented [[Xorg#Setting_DPI_manually|here]].
 +
 
 +
==== Space efficiency ====
 +
 
 +
The Plasma Netbook shell has been dropped from Plasma 5, see the following [https://forum.kde.org/viewtopic.php?f=289&t=126631&p=335947&hilit=plasma+netbook#p335899 KDE forum post]
 +
However, you can achieve something similar by editing the file {{ic|~/.config/kwinrc}} adding
 +
{{ic|1=BorderlessMaximizedWindows=true}} in the {{ic|[Windows]}} section.
  
 
=== Printing ===
 
=== Printing ===
{{Tip|Use the [[CUPS]] web interface for faster configuration.}}
 
  
The printers are configured in this way can be found in applications KDE.  
+
{{Tip|Use the [[CUPS]] web interface for faster configuration. Printers configured in this way can be used in KDE applications. }}
  
You can also choose the printer configuration through '''System Settings -> Printer Configuration'''. To use this method, you must first install the packages {{Pkg|kdeutils-print-manager}} and {{Pkg|cups}}.
+
You can also configure printers in ''System Settings > Printer Configuration''. To use this method, you must first install {{Pkg|print-manager}} and {{Pkg|cups}}.
  
You need to start the avahi-daemon and cupsd daemons first or you will get the following error:  
+
The {{ic|avahi-daemon.service}} and {{ic|org.cups.cupsd.service}} daemons must be started first; otherwise, you will get the following error:
{{bc|The service 'Printer Configuration' does not provide an interface 'KCModule'  
+
The service 'Printer Configuration' does not provide an interface 'KCModule'
with keyword 'system-config- printer-kde/system-config-printer-kde.py'  
+
with keyword 'system-config- printer-kde/system-config-printer-kde.py'
The factory does not support creating components of the specified type.
+
The factory does not support creating components of the specified type.
}}
+
  
If you are getting the following error, you need to give the user rights to manage printers:
+
If you are getting the following error, you need to give your user the right to manage printers.
 
  There was an error during CUPS operation: 'cups-authorization-canceled'
 
  There was an error during CUPS operation: 'cups-authorization-canceled'
  
For CUPS, this is set in {{ic|/etc/cups/cupsd.conf}}.
+
For CUPS, this is set in {{ic|/etc/cups/cups-files.conf}}.
  
Adding '''lp''' to '''SystemGroup''' allows anyone who can print to configure printers. You can, of course, add another group instead of '''lp'''.
+
Adding {{ic|lpadmin}} to {{ic|/etc/group}} and then to the {{ic|SystemGroup}} directive in {{ic|/etc/cups/cups-files.conf}} allows anyone in the {{ic|lpadmin}} group to configure printers. Do ''not'' add the {{ic|lp}} group to the {{ic|SystemGroup}} directive, or printing will fail.
{{hc|/etc/cups/cupsd.conf|# Administrator user group...
+
SystemGroup sys root lp}}
+
  
===Samba/Windows support===
+
# groupadd -g107 lpadmin
If you want to have access to Windows services install [[Samba]] (package {{Pkg|samba}}).
+
  
You may then configure your Samba shares through
+
{{hc|/etc/cups/cups-files.conf|# Administrator user group...
 +
SystemGroup sys root lpadmin}}
  
  System Settings -> Sharing -> Samba
+
{{Tip|Read [[CUPS#Configuration]] to get more details on how to configure CUPS.}}
  
=== KDE Desktop Activities ===
+
=== Samba/Windows support ===
KDE Desktop Activities are Plasma based "virtual desktop"-like set of Plasma Widgets where you can independently configure widgets as if you had more than one screens/desktops.
+
  
On your desktop, click the Cashew Plasmoid and on the pop-up window press "Activities".
+
If you want to have access to Windows services, install [[Samba]] (package {{Pkg|samba}}).
  
A plasma bar will appear at the bottom of the screen which presents you the current Plasma Desktop Activities which exist. You can then navigate between them by pressing their correspondent icon.
+
The Dolphin share functionality requires usershares, which the stock smb.conf does not have enabled. Instructions to add them are in [[Samba#Creating usershare path]], after which sharing in Dolphin should work out of the box after restarting Samba.
  
===Power Saving===
+
=== KDE Desktop activities ===
KDE has an integrated power saving service called "'''Powerdevil Power Management'''" that may adjust the power saving profile of the system and/or the brightness of the screen (if supported).
+
  
==== How to enable Cpufreq based power saving ====
+
KDE Desktop Activities are Plasma-based virtual-desktop-like sets of Plasma Widgets where you can independently configure widgets as if you have more than one screen or desktop.
Since KDE 4.6, CPU frequency scaling is no longer managed by KDE.  Instead it is assumed to be handled automatically by the the hardware and/or kernel.  Arch uses {{ic|ondemand}} as default cpufreq governor from kernel vesion 3.3. See [[cpufreq|wiki article on cpufreq]].
+
  
If you are happy with setting your governor once at boot (with the {{ic|cpufreq}} daemon script, for example) then this section is not relevant and can be skipped.
+
On your desktop, click the Cashew Plasmoid and, on the pop-up window, press "Activities".
  
1. If you have not already done so, install the {{Pkg|cpufrequtils}} package (for the '''cpufreq-set''' utility).
+
A plasma bar presenting you the current existing Plasma Desktop Activities will appear at the bottom of the screen. You can navigate between them by pressing the correspondent icons.
  
2. Next, you will need to grant access to '''cpufreq-set''' for the appropriate users by configuring [[sudo]].  For example, if you are part of the ''wheel'' group, you could use {{ic|visudo}} to add
+
=== Power saving ===
%wheel ALL = (ALL) NOPASSWD: /usr/bin/cpufreq-set
+
to your {{ic|sudoers}} file.
+
  
3. From '''System Settings > Power Management > Power Profiles''' select a profile to edit or create a new one.  Check the '''Run Script''' option and add an appropriate {{ic|cpufreq-set}} command for the selected power profile. For example, your "Powersave" profile might have:
+
Plasma has an integrated power saving service called "'''Powerdevil Power Management'''" that may adjust the power saving profile of the system and/or the brightness of the screen (if supported).
sudo cpufreq-set -r -g ondemand
+
Your "Performance" profile might have
+
sudo cpufreq-set -r -g performance
+
  
{{Note | The ''cpufreq-set'' examples above may be insufficient for setting the governor for all processors/cores.
+
{{Accuracy|Regarding the note below, it might be that the problem is the logind setting ''LidSwitchIgnoreInhibited'' which defaults to ''yes''. [https://bbs.archlinux.org/viewtopic.php?pid&#61;1649022#p1649022]}}
For some CPU families the {{ic|-r}} switch may not set the governor for all cores/cpus and instead only set the governor for CPU 0.  In this case you will need to write a script to iterate through all your cores. A simple script for a four core system could look like:
+
#!/bin/bash
+
for i in {0..3}; do
+
  sudo /usr/bin/cpufreq-set -c${i} -gondemand
+
done
+
}}
+
  
{{Note | You can check which governors are active with {{ic|cpufreq-info -o}} or less intuitively by inspecting {{ic|/sys/devices/system/cpu/cpu*/cpufreq/scaling_governor}}.
+
{{Note|Powerdevil may not [[Power management#Power managers|inhibit]] all logind settings (such as the lid close action for laptops). In these cases, the logind setting itself will need to be changed - see [[Power management#Power management with systemd]].}}
 +
 
 +
=== Monitoring changes on local files and directories ===
 +
 
 +
KDE now uses '''inotify''' directly from the kernel with '''kdirwatch''' (included in kdelibs), so Gamin or FAM are no longer needed. You may want to install this {{AUR|kdirwatch}}{{Broken package link|{{aur-mirror|kdirwatch}}}} from AUR which is a GUI frontend for kdirwatch.
 +
 
 +
=== Autostarting applications ===
 +
 
 +
Plasma can autostart applications and run scripts on startup and shutdown. To autostart an application, start {{ic|systemsettings}} and navigate to ''Startup and Shutdown'' -> ''Autostart'' and add the program or shell script of your choice. For applications, a {{ic|.desktop}} file will be created, for shell scripts, a symlink will be created.
 +
{{Note|
 +
* Programs can be autostarted on login only, whilst shell scripts can also be run on shutdown or even before Plasma itself starts.
 +
* Shell scripts will only be run if they are marked executable.
 
}}
 
}}
  
===Monitoring changes on local files and directories===
+
Place [[Desktop entries]] (i.e. {{ic|.desktop}} files) here:
KDE now uses '''inotify''' directly from the kernel with '''kdirwatch''' (included in kdelibs), so Gamin or FAM are no longer needed. You may want to install this {{AUR|kdirwatch}} from AUR which is a GUI frontend for kdirwatch.
+
;{{ic|~/.config/autostart}}:for starting applications at login.
  
==System Administration==
+
Place or symlink shell scripts in one of the following directories:
===Set keyboard layout in order switch language inputs===
+
;{{ic|~/.config/plasma-workspace/env}}:for executing scripts at login before launching Plasma.
In order to do that, navigate to
+
;{{ic|~/.config/autostart-scripts}}:for executing scripts at login.
    System Settings > Hardware > Input Devices > Keyboard
+
;{{ic|~/.config/plasma-workspace/shutdown}}:for executing scripts on shutdown.
There you may choose your keyboard model at first.
+
{{Note| It is preferable that, if you use Evdev, that means Xorg automatic configuration for keyboards, you should choose "Evdev-managed keyboard".}}
+
In the "'''Layouts'''" tab, you choose the languages you may want to use by pressing the "Add Layout" button and therefore the variant and the language.
+
In the "'''Advanced'''" tab, you can choose the keyboard combination you want in order to change the layouts in the "Key(s) to change layout" sub-menu.
+
  
===Terminate Xorg-server through KDE system settings===
+
== System administration ==
Navigate to
+
    System Settings -> Input Devices -> Keyboard -> Advanced (tab) > "Key Sequence to kill the X server" submenu
+
and tick the checkbox.
+
  
===Useful KCM===
+
=== Terminate Xorg server through KDE System Settings ===
KCM means KConfig Module. This modules help you to configure you system providing a interface on System Settings.
+
  
'''Configuration for look&feel of your GTK apps.'''
+
Navigate to the submenu ''System Settings > Input Devices > Keyboard > Advanced (tab) > "Key Sequence to kill the X server"'' and ensure that the checkbox is ticked.
* {{AUR|kde-gtk-config}} (formerly known as chakra-gtk-config).
+
* {{AUR|kcm-gtk}}
+
* {{AUR|kcm-qt-graphicssystem}}
+
  
'''Configuration for the GRUB2 bootloader.'''
+
=== KCM ===
* {{AUR|grub2-editor}}
+
 
* {{AUR|kcm-grub2}}
+
KCM stands for '''KC'''onfig '''M'''odule. KCMs can help you configure your system by providing interfaces in System Settings, or through the command line with ''kcmshell5''.
 +
 
 +
'''Configuration for look and feel of GTK applications.'''
 +
* {{Pkg|kde-gtk-config}}
 +
* {{AUR|kcm-gtk}}{{Broken package link|{{aur-mirror|kcm-gtk}}}}
 +
* {{AUR|kcm-qt-graphicssystem}}
  
'''Configuration for Synaptics driver based touchpads.'''
+
'''Configuration for the GRUB bootloader.'''
* {{Pkg|synaptiks}}
+
* {{AUR|grub2-editor}}{{Broken package link|{{aur-mirror|grub2-editor}}}}
* {{AUR|kcm_touchpad}}
+
  
'''Configuration for [[Firewalls#ufw|UFW]]'''
+
'''Configuration for the [[Uncomplicated Firewall]] (UFW)'''
 
* {{AUR|kcm-ufw}}
 
* {{AUR|kcm-ufw}}
  
Line 254: Line 277:
 
* {{AUR|kcm-polkit-kde-git}}
 
* {{AUR|kcm-polkit-kde-git}}
  
'''Configuration for Wacom Tablet'''
+
'''Configuration for Wacom tablets'''
 
* {{AUR|kcm-wacomtablet}}
 
* {{AUR|kcm-wacomtablet}}
  
More KCM can be found [http://kde-apps.org/index.php?xcontentmode=273 here].
+
'''Configuration for systemd'''
 +
* {{Pkg|systemd-kcm}}
  
==Desktop Search and Semantic Desktop==
+
More KCMs can be found at [http://kde-apps.org/index.php?xcontentmode=273 kde-apps.org].
According to [https://en.wikipedia.org/wiki/Semantic_desktop Wikipedia], ''"the Semantic Desktop is a collective term for ideas related to changing a computer's user interface and data handling capabilities so that data is more easily shared between different applications or tasks and so that data that once could not be automatically processed by a computer can be (automatically processed)."''
+
  
The KDE implementation of this concept is tied to (as of KDE 4.10) two major pieces of software, Akonadi and Nepomuk. Between the two of them, these programs look at your data and make an easily searchable index of it. The idea behind these pieces of software is to make your system "aware" of your data and give it context using meta-data and user-supplied tags.
+
== Desktop search ==
  
Soprano and Virtuoso are two dependencies of the Nepomuk Semantic Desktop. Since the relationship between the two major components and their dependencies is not very clear, the following sections try to shed some light on their inner workings.
+
KDE implements desktop search with a software called Baloo, a file indexing and searching solution.
  
===Virtuoso and Soprano===
+
=== Baloo ===
  
The database used to store all the metadata used by the semantic desktop is a ''[https://en.wikipedia.org/wiki/Resource_Description_Framework Resource Description Framework (RDF)]'' database called Virtuoso. Internally, Virtuoso may be looked as a relational database. (A [https://en.wikipedia.org/wiki/Relational_model relational database] is different from a traditional single-table based database in the sense that it uses multiple tables related by a single key in order to store data.) It is currently controlled by OpenLink, and is available under commercial and an open source license.
+
==== Using and configuring Baloo ====
  
From the [http://techbase.kde.org/Projects/Nepomuk/ComponentOverview#Soprano KDE Techbase], ''Soprano is a Qt abstraction over databases. It provides a friendly Qt-based API for accessing different RDF stores. It currently supports 3 database backends - Sesame, Redland and Virtuoso. The KDE Semantic Stack only works with Virtuoso. Soprano also provides additional features such as serializing, parsing RDF data, and a client server architecture that is heavily used in Nepomuk.''
+
In order to search using Baloo on the KDE Plasma Desktop, press {{ic|ALT+F2}} and type in your query. Within Dolphin press {{ic|CTRL+F}}.
  
===Nepomuk===
+
By default the Desktop Search KCM exposes only two options: A panel to blacklist folders and a way to disable it with one click.
Nepomuk stands for "Networked Environment for Personal, Ontology-based Management of Unified Knowledge". It is what allows all the tagging and labeling of files as well to take place and also serves as the way to actually read the Virtuoso databases. It provides an API to application developers which allows them to read the data collected by it.
+
  
In the past, the "Strigi" service was used to collect data about the various files present on the system. However, due to many reasons, the most important of them being CPU and Memory usage, Strigi was replaced by a homegrown indexing service which is integrated with Nepomuk-Core.
+
Alternatively you can edit your {{ic|~/.config/baloofilerc}} file ([https://community.kde.org/Baloo/Configuration info]). Additionally the {{ic|balooctl}} process can also be used. In order to disable Baloo run {{ic|balooctl disable}}.
  
For further information about Nepomuk, [http://techbase.kde.org/Projects/Nepomuk/ComponentOverview#Nepomuk_Components this page] is a good resource. However, some of the information in the previous page has been rendered outdated according to [http://vhanda.in/blog/2012/11/nepomuk-without-strigi/ this blog post].
+
Once you added additional folders to the blacklist or disabled Baloo entirely, a process named {{ic|baloo_file_cleaner}} removes all unneeded index files automatically. They are stored under {{ic|~/.local/share/baloo/}}.
  
====Using and configuring Nepomuk====
+
More advanced configuration options are available through {{AUR|kcm_baloo_advanced}}{{Broken package link|{{aur-mirror|kcm_baloo_advanced}}}}.
  
In order to search using Nepouk on the KDE desktop, press '''ALT+F2''' and type in your query. Nepomuk is enabled by default. It can be turned on and off in
+
==== How do I index a removable device? ====
System Settings -> Desktop Search
+
  
Nepomuk has to keep track of a lot of files. It is for this reason that it is recommended to increase the number of files that can be watched with inotify. In order to do that this command is a good option.
+
By default every removable device is blacklisted. You just have to remove your device from the blacklist in the KCM panel.
sysctl fs.inotify.max_user_watches=524288
+
  
To do it persistently:
+
=== Web browsers ===
echo "fs.inotify.max_user_watches = 524288" >> /etc/sysctl.conf
+
==== Konqueror and Rekonq ====
 +
Konqueror supports two rendering engines – KHTML and QtWebKit (via the {{Pkg|kwebkitpart}} package) – Rekonq supports only QtWebKit. KHTML development was halted after Qt shipped WebKit but was kept for compatibility reasons. QtWebKit, in turn, has since been [https://www.mail-archive.com/development@qt-project.org/msg18866.html deprecated] by the Qt Project and replaced by [[Chromium]]-based Qt WebEngine which is currently not supported by either Konqueror or Rekonq.
  
Restart Nepomuk to see the changes.
+
A successor named Fiber is currently in development, which will use Chromium's engine.
  
====KDE without Nepomuk====
+
==== Firefox ====
If you wish to run KDE without Nepomuk, there exists a {{AUR|nepomuk-core-fake}} package in the AUR.
+
Firefox can be configured to better integrate with Plasma. See [[Firefox#KDE_integration|Firefox KDE integration]] for details.
{{Warning|As of now, Dolphin depends on {{Pkg|nepomuk-widgets}} and hence will break if used with the fake Nepomuk package}}
+
  
===Akonadi===
+
==== Qupzilla ====
Akonadi is a system meant to act as a local cache for PIM data, regardless of its origin, which can be then used by other applications. This includes the user's emails, contacts, calendars, events, journals, alarms, notes, and so on. It interfaces with the Nepomuk libraries to provide searching capabilities.
+
Qupzilla ({{Pkg|qupzilla}}) is a Qt web browser with Plasma integration features. Qupzilla 2.0 will use Qt WebEngine intead of WebKit.
  
Akonadi does not store any data by itself: the storage format depends on the nature of the data (for example, contacts may be stored in vcard format).
+
== PIM ==
  
For more information on Akonadi and its relationship with Nepomuk, see [http://blogs.kde.org/node/4503] and [http://cmollekopf.wordpress.com/2013/02/13/kontact-nepomuk-integration-why-data-from-akonadi-is-indexed-in-nepomuk/].
+
KDE offers its own stack for personal information management. This includes emails, contacts, calendar, etc.
 +
 
 +
=== Akonadi ===
 +
 
 +
Akonadi is a system meant to act as a local cache for PIM data, regardless of its origin, which can be then used by other applications. This includes the user's emails, contacts, calendars, events, journals, alarms, notes, and so on.
 +
 
 +
Akonadi does not store any data by itself: the storage format depends on the nature of the data (for example, contacts may be stored in vCard format).
  
 
==== Disabling Akonadi ====
 
==== Disabling Akonadi ====
 +
 
See this [http://userbase.kde.org/Akonadi#Disabling_the_Akonadi_subsystem section in the KDE userbase].
 
See this [http://userbase.kde.org/Akonadi#Disabling_the_Akonadi_subsystem section in the KDE userbase].
  
 
==== Database configuration ====
 
==== Database configuration ====
 +
 
Start {{ic|akonaditray}} from package {{Pkg|kdepim-runtime}}. Right click on it and select '''configure'''. In the Akonadi server configure tab, you can:
 
Start {{ic|akonaditray}} from package {{Pkg|kdepim-runtime}}. Right click on it and select '''configure'''. In the Akonadi server configure tab, you can:
* Configuring Akonadi to use MySQL Server running on the System
+
* Configuring Akonadi to use MySQL/MariaDB Server
* Configuring Akonadi to use sqlite
+
** If your home directory is on a ZFS pool, you will need to create {{ic|~/.config/akonadi/mysql-local.conf}} with the following contents:
 +
 
 +
[mysqld]
 +
innodb_use_native_aio = 0
 +
 
 +
Otherwise you will get the [[MySQL#OS error 22 when running on ZFS|OS error 22]]
 +
* Configuring Akonadi to use PostgreSQL Server
 +
* Configuring Akonadi to use SQLite
 +
** Edit {{ic|~/.config/akonadi/akonadiserverrc}} to match the below
 +
 
 +
[General]
 +
Driver=QSQLITE3
 +
 +
[QSQLITE3]
 +
Name=/home/username/.local/akonadi/akonadi.db
 +
 
 +
== Phonon ==
  
====Running KDE without Akonadi====
+
From [[Wikipedia:Phonon (software)|Wikipedia]]:
The package {{AUR|akonadi-fake}} is a good option for those who wish to run KDE without Akonadi.
+
  
==Phonon==
+
:''“Phonon is the multimedia API provided by KDE and is the standard abstraction for handling multimedia streams within KDE software and also used by several Qt applications.
===What is Phonon?===
+
''Phonon is the multimedia API for KDE 4. Phonon was created to allow KDE 4 to be independent of any single multimedia framework such as GStreamer or xine and to provide a stable API for KDE 4's lifetime. It was done for various reasons: to create a simple KDE/Qt style multimedia API, to better support native multimedia frameworks on Windows and Mac OS X, and to fix problems of frameworks becoming unmaintained or having API or ABI instability.
+
''
+
  
from Wikipedia.
+
Phonon was originally created to allow KDE and Qt software to be independent of any single multimedia framework such as GStreamer or xine and to provide a stable API for a major version's lifetime.”''
  
 
'''Phonon''' is being widely used within KDE, for both audio (e.g., the System notifications or KDE audio apps) and video (e.g., the Dolphin video thumbnails).
 
'''Phonon''' is being widely used within KDE, for both audio (e.g., the System notifications or KDE audio apps) and video (e.g., the Dolphin video thumbnails).
  
===Which backend should I choose?===
+
=== Which backend should I choose? ===
You can choose between various backends, like GStreamer ({{Pkg|phonon-gstreamer}}) or VLC ({{Pkg|phonon-vlc}}) available in [[Official Repositories|extra]], Xine ({{AUR|phonon-xine}}) or  MPlayer ({{AUR|phonon-mplayer-git}}) available on [[Arch User Repository|AUR]].  Most users will want GStreamer or VLC which have the best upstream support. Note that multiple backends can be installed at once and you can switch between them via System Settings -> Multimedia -> Phonon -> Backend.
+
You can choose between backends based on [[GStreamer]] and [[VLC]] – each available in versions for Qt4 applications and Qt5 applications ({{Pkg|phonon-qt4-gstreamer}}, {{Pkg|phonon-qt5-gstreamer}} {{Pkg|phonon-qt4-vlc}}, {{Pkg|phonon-qt5-vlc}}).
  
{{Note|According to the [http://userbase.kde.org/Phonon#Backend_libraries KDE UserBase], Phonon-MPlayer and Phonon-Xine are currently unmaintained}}
+
[https://www.phoronix.com/scan.php?page=news_item&px=MTUwNDM Upstream prefers VLC] but prominent Linux distributions (Kubuntu and Fedora-KDE for example) prefer GStreamer because that allows them to easily leave out patented MPEG codecs from the default installation. Both backends have a slightly different [http://community.kde.org/Phonon/FeatureMatrix features set.]
  
According to [https://www.archlinux.org/news/kde-sc-46-to-extra/ announcement of KDE 4.6 in Arch] and [http://mail.kde.org/pipermail/phonon-backends/2011-February/000500.html mail in Phonon dev list], users should prefer GStreamer over VLC due to the feature difference.
+
In the past other backends were developed as well but are no longer maintained and their AUR packages have been deleted.
 +
 
 +
{{Note|1=<br>
 +
* Multiple backends can be installed at once and prioritized at ''System Settings > Multimedia > Phonon > Backend''. For Plasma 5 this would be ''System Settings > Multimedia > Backend''.
 +
* According to the [https://forum.kde.org/viewtopic.php?f=250&t=126476&p=335080 KDE forums], the VLC backend lacks support for [[wikipedia:ReplayGain|ReplayGain]].}}
 +
 
 +
== Useful applications ==
  
== Useful Applications ==
 
 
The official set of KDE applications may be found [http://www.kde.org/applications/ here].
 
The official set of KDE applications may be found [http://www.kde.org/applications/ here].
  
 
=== Yakuake ===
 
=== Yakuake ===
[http://yakuake.kde.org/ This] application provides a Quake-like terminal emulator, which is toggled visible using the F12 key. It also has support for multiple tabs. Yakuake can be installed by package {{pkg|yakuake}}.
 
  
===  KDE Telepathy ===
+
[[Yakuake]] provides a Quake-like terminal emulator whose visibility is toggled by the F12 key. It also has support for multiple tabs. Yakuake is available in the package {{Pkg|yakuake}}.
[http://community.kde.org/KTp KDE Telepathy] is a project with the goal to closely integrate Instant Messaging with the KDE desktop. It utilizes the Telepathy framework as a backend, and is intended to replace Kopete.
+
  
To install all Telepathy protocols install the {{grp|telepathy}} group.
+
=== KDE Telepathy ===
To use the KDE Telepathy client, install the {{pkg|kde-telepathy-meta}} package that includes all the packages contained in the {{grp|kde-telepathy}} group .
+
 
 +
[http://community.kde.org/KTp KDE Telepathy] is a project with the goal to closely integrate Instant Messaging with the KDE desktop. It utilizes the Telepathy framework as a backend and is intended to replace Kopete.
 +
 
 +
To install all Telepathy protocols, install the {{Grp|telepathy}} group.
 +
To use the KDE Telepathy client, install the {{Pkg|telepathy-kde-meta}} package that includes all the packages contained in the {{Grp|telepathy-kde}} group.
 +
 
 +
==== Use Telegram with KDE Telepathy ====
 +
 
 +
Telegram protocol is available using {{pkg|telepathy-haze}}, installing {{aur|telegram-purple}} or {{aur|telegram-purple-git}} and {{aur|telepathy-morse-git}}. The username is the Telegram account telephone number (complete with the national prefix '+xx', e.g. '+49' for Germany). The configuration through the GUI may be tricky: if the phone number is not accepted when configuring a new account in the KDE Telepathy client (with an error message complaining about an invalid parameter which prevents the account creation), insert it between single quotes and then remove the quotes manually from the configuration file ({{ic|~/.local/share/telepathy/mission-control/accounts.cfg}}) after the account creation (if the quotes are not removed after, an authentication error should rise). Note that the configuration file should be edited manually when KDE Telepathy is not running, e.g. when there is no KDE desktop session active, otherwise manual changes may be overwritten by the software.
  
 
== Tips and tricks ==
 
== Tips and tricks ==
=== Configure KWin to use OpenGL ES ===
 
Beginning with KWin version 4.8 it is possible to use the separately built binary '''kwin_gles''' as a replacement for kwin. It behaves almost the same as the kwin executable in OpenGL2 mode with the slight difference that it uses ''egl'' instead of ''glx'' as the native platform interface. To test kwin_gles you just have to run {{ic|kwin_gles --replace}} in Konsole.
 
If you want to make this change permanent you have to create a script in {{Ic|`kde4-config --localprefix`/env/}} which exports {{Ic|1=KDEWM=kwin_gles}}.
 
  
=== Enabling video thumbnails under Konqueror/Dolphin file managers ===
+
=== Using an alternative window manager ===
For thumbnails of videos in konqueror and dolphin install {{Pkg|kdemultimedia-mplayerthumbs}} or {{Pkg|kdemultimedia-ffmpegthumbs}}.
+
There may be reasons you want to use another window manager than KWin, for example to work around the DRI bug that causes [[PRIME#Black_screen_with_GL-based_compositors|black screen with PRIME]].
 +
 
 +
To use an alternative [[window manager]] with Plasma open the ''System Settings'' panel, navigate to ''(Default) Applications > Window Manager > Use a different window manager'' and select the window manager you wish to use from the list.
 +
 
 +
==== KDE/Openbox session ====
 +
 
 +
The {{Pkg|openbox}} package provides a session for using KDE with [[Openbox]]. To make use of this session, select ''KDE/Openbox'' from the [[display manager]] menu.
 +
 
 +
For those starting the session manually, add the following line to your {{ic|.xinitrc}} file:
 +
exec openbox-kde-session
 +
 
 +
==== Compiz custom ====
 +
 
 +
If you need to run Compiz with custom options and switches select ''Compiz custom'' and then create a script called {{ic|compiz-kde-launcher}} and add to it the commands you wish to use to start Compiz. See the example below:
 +
 
 +
{{hc|/usr/local/bin/compiz-kde-launcher|<nowiki>
 +
#!/bin/bash
 +
LIBGL_ALWAYS_INDIRECT=1
 +
compiz --replace &
 +
wait
 +
</nowiki>}}
 +
 
 +
Then make it executable:
 +
$ chmod +x /usr/local/bin/compiz-kde-launcher
 +
 
 +
==== Re-enabling compositing effects ====
 +
 
 +
When replacing Kwin with a window manager which does not provide a Compositor (such as Openbox), any desktop compositing effects e.g. transparency will be lost. In this case, install and run a separate Composite manager to provide the effects such as [[Xcompmgr]] or [[Compton]].
 +
 
 +
=== Integrate Android ===
 +
 
 +
KDE Connect provides several features for you:
 +
* Share files and URLs to/from KDE from/to any app, without wires.
 +
* Touchpad emulation: Use your phone screen as your computer's touchpad.
 +
* Notifications sync (4.3+): Read your Android notifications from the desktop.
 +
* Shared clipboard: copy and paste between your phone and your computer.
 +
* Multimedia remote control: Use your phone as a remote for Linux media players.
 +
* WiFi connection: no usb wire or bluetooth needed.
 +
* RSA Encryption: your information is safe.
 +
 
 +
You will need to install KDE Connect both on your computer and on your Android. For PC side, install {{Pkg|kdeconnect}} package. For Android side, install {{ic|KDE Connect}} from [https://play.google.com/store/apps/details?id=org.kde.kdeconnect_tp Google Play] or from [https://f-droid.org/repository/browse/?fdid=org.kde.kdeconnect_tp F-Droid].
 +
 
 +
=== Configure KWin to use OpenGL ES ===
 +
Set environment variable {{ic|KWIN_COMPOSE}} to 'O2ES' to force the OpenGL ES backend. Please note that OpenGL ES is not supported by all drivers.
  
 
=== Speed up application startup ===
 
=== Speed up application startup ===
User Rob wrote on his blog this "[http://kdemonkey.blogspot.nl/2008/04/magic-trick.html magic trick]" to improve applications start up by 50-150ms.
+
 
 +
User Rob described a "[http://kdemonkey.blogspot.nl/2008/04/magic-trick.html magic trick]" on his blog to improve application start-up time by 50-150ms.
 
To enable it, create this folder in your home:
 
To enable it, create this folder in your home:
{{bc|$ mkdir -p ~/.compose-cache}}
+
$ mkdir ~/.compose-cache/
 +
It can produce freezes under heavy io. To avoid this, also do:
 +
$ ln -sfv /run/user/$UID/ /home/$USER/.compose-cache
  
"For those curious about what is going on here, this enables an optimization which Lubos (of general KDE speediness fame) came up with some time ago and was then rewritten and integrated into libx11. Ordinarily on startup applications read input method information from {{ic|/usr/share/X11/locale/<your locale>/Compose}}. This Compose file is quite long (>5000 lines for the en_US.UTF-8 one) and takes some time to process. libX11 can create a cache of the parsed information which is much quicker to read subsequently, but it will only re-use an existing cache or create a new one in {{ic|~/.compose-cache}} if the directory already exists." [Cit. Rob]
+
{{Note|For those curious about what is going on here, this enables an optimization which Lubos (of general KDE speediness fame) came up with some time ago and was then rewritten and integrated into libx11. Ordinarily, on startup, applications read input method information from {{ic|/usr/share/X11/locale/''your locale''/Compose}}. This file is quite long (>5000 lines for the en_US.UTF-8 one) and takes some time to process. libX11 can create a cache of the parsed information which is much quicker to read subsequently, but it will only re-use an existing cache or create a new one in {{ic|~/.compose-cache}} if the directory already exists.}}
  
===Hiding partitions===
+
=== Configuring monitor resolution / multiple monitors ===
In Dolphin, it is as simple as right-clicking on the partition in the 'Places' sidebar and selecting 'Hide <partition>'. Otherwise...
+
  
If you wish to prevent your internal partitions from appearing in your file manager, you can create an udev rule, for example {{ic|/etc/udev/rules.d/10-local.rules}}:
+
To enable display resolution management and multiple monitors in Plasma 5, install {{Pkg|kscreen}}. This adds the additional options to System Settings/Display and Monitor.
  
KERNEL=="sda[0-9]", ENV{UDISKS_IGNORE}="1"
+
=== Open application launcher with Super key (Windows key) ===
  
The same thing for a certain partition:
+
Install and start {{Pkg|ksuperkey}}. Now assign Alt + F1 as hot key. The Super Key will now open the application launcher. You can add ksuperkey to the autostart if you don't want to start it manually.
  
KERNEL=="sda1", ENV{UDISKS_IGNORE}="1"
+
== Troubleshooting ==
KERNEL=="sda2", ENV{UDISKS_IGNORE}="1"
+
  
=== Konqueror Tips ===
+
=== Configuration related ===
==== Disabling Smart Key Tooltips (Browser) ====
+
To disable those smart key tooltips in Konqueror (pressing {{keypress|CTRL}} on a web page), open {{Ic|~/.kde4/share/config/konquerorrc}} and add this section:
+
  
{{bc|1=
+
Many problems in KDE are related to configuration.
[Access Keys]
+
 
Enabled=false
+
==== Plasma desktop behaves strangely ====
}}
+
 
 +
Plasma problems are usually caused by unstable '''Plasma widgets''' (colloquially called ''plasmoids'')  or '''Plasma themes'''. First, find which was the last widget or theme you had installed and disable it or uninstall it.
 +
 
 +
So, if your desktop suddenly exhibits "locking up", this is likely caused by a faulty installed widget. If you cannot remember which widget you installed before the problem began (sometimes it can be an irregular problem), try to track it down by removing each widget until the problem ceases. Then you can uninstall the widget, and file a bug report (bugs.kde.org) '''only if it is an official widget'''. If it is not, it is recommended you find the entry on kde-look.org and inform the developer of that widget about the problem (detailing steps to reproduce, etc).
 +
 
 +
If you cannot find the problem, but you do not want ''all'' the settings to be lost, navigate to {{ic|~/.config}}:
 +
 
 +
$ for j in plasma*; do mv -- "$j" "${j%}.bak"; done
 +
 
 +
This command will '''rename all Plasma related configs''' to *.bak (e.g. {{ic|plasmarc.bak}}) of your user and when you will relogin into Plasma, you will have the '''default''' settings back. To undo that action, remove the .bak file extension. If you already have *.bak files, rename, move, or delete them first. It is highly recommended that you create regular backups anyway. See [[Synchronization and backup programs]] for a list of possible solutions.
 +
 
 +
==== Clean cache to resolve upgrade problems ====
 +
 
 +
The [https://bbs.archlinux.org/viewtopic.php?id=135301 problem] may be caused by old cache. Sometimes after an upgrade, the old cache might introduce strange, hard to debug behaviour such as unkillable shells, hangs when changing various settings and several other problems such as ark being unable to unrar or unzip or amarok not recognizing any of your music. This solution can also resolve problems with KDE and Qt programmes looking bad following upgrade.
 +
 
 +
Rebuild your cache with the following commands:
 +
 
 +
$ rm ~/.config/Trolltech.conf
 +
$ kbuildsycoca4 --noincremental
  
==== Disabling The Sidebar Tab (Filemanager) ====
+
Hopefully, your problems are now fixed.
To disable this small sidebar tab on the left side, open {{Ic|~/.kde4/share/config/konqsidebartng.rc}} and set {{Ic|HideTabs}} to {{Ic|true}}.
+
  
==== Using WebKit ====
+
=== Clean akonadi configuration to fix KMail ===
WebKit is an open source browser engine developed by Apple Inc. It is a derivative from the KHTML and KJS libraries and contains many improvements. WebKit is used by Safari, Google Chrome and rekonq.
+
  
It is possible to use WebKit in Konqueror instead of KHTML. First install the {{Pkg|kwebkitpart}} package.
+
First, make sure that KMail is not running. Then backup configuration:
 +
$ mv ~/.local/share/akonadi ~/.local/share/akonadi-old
 +
$ mv ~/.config/akonadi ~/.config/akonadi-old
  
Then, after executing Konqueror, press '''Settings > Configure Konqueror'''.  
+
Start ''SystemSettings > Personal'' and remove all the resources. Go back to Dolphin and remove the original {{ic|~/.local/share/akonadi}} and
 +
{{ic|~/.config/akonadi}} - the copies you made ensure that you can back-track if necessary.
  
On the "General" submenu, select the "WebKit" as the "Default web browser engine".
+
Now go back to the System Settings page and carefully add the necessary resources. You should see the resource reading in your mail folders. Then start Kontact/KMail to see if it work properly.
  
=== Firefox integration ===
+
=== Fix empty IMAP inbox ===
See [[Firefox#KDE_integration]].
+
  
==Troubleshooting==
+
For some IMAP accounts, kmail will show the inbox as a container with all other folders of this account inside. Kmail does not show messages in the inbox container but in all other subfolders [https://bugs.kde.org/show_bug.cgi?id=284172]. To solve this problem simply disable the server side subscribition in the kmail account settings.
===Getting current state of KWin for support and debug purposes===
+
This command prints out a wonderful summary of the current state of KWin including used options, used compositing backend and relevant OpenGL driver capabilities. [http://blog.martin-graesslin.com/blog/2012/03/on-getting-help-for-kwin-and-helping-kwin/ See more at Martin's blog]
+
  
qdbus org.kde.kwin /KWin supportInformation
+
=== Getting current state of KWin for support and debug purposes ===
  
===KDE4 does not finish loading===
+
This command prints out a wonderful summary of the current state of KWin including used options, used compositing backend and relevant OpenGL driver capabilities. See more on [http://blog.martin-graesslin.com/blog/2012/03/on-getting-help-for-kwin-and-helping-kwin/ Martin's blog].
There might be a situation in which the graphic driver might create a conflict when starting KDE4. This situation happens after the login but before finishing loading the desktop, making the user wait indefinitely at the loading screen. Until now the only users confirmed to be affected by this are the ones that use Nvidia drivers and KDE4.
+
  
A solution for Nvidia users is to edit the file at {{ic|/home/user/.kde4/share/config/kwinrc}} and change the option '''Enabled=true''' to '''false''' in the '''[Compositing]''' section. For more information look at this [https://bbs.archlinux.org/viewtopic.php?pid=932598 thread].
+
$ qdbus org.kde.kwin /KWin supportInformation
  
If a minimal install was done, make sure you installed the required font by your phonon backend listed here: [[KDE#Minimal_install]]
+
=== KDE and Qt programs look bad when in a different window manager ===
  
===KDE and Qt programs look bad when in a different window manager===
+
If you are using KDE or Qt programs but not in a full Plasma session (specifically, you did not run {{ic|startkde}}), then as of Plasma 4.6.1 you will need to tell Qt how to find KDE's styles (Oxygen, QtCurve etc.)
If you are using KDE or Qt programs but not in a full KDE session (specifically, you did not run "startkde"), then as of KDE 4.6.1 you will need to tell Qt how to find KDE's styles (Oxygen, QtCurve etc.)
+
  
You just need to set the environment variable QT_PLUGIN_PATH. E.g. put
+
You just need to set the environment variable {{ic|QT_PLUGIN_PATH}}. E.g. put:
  
 
  export QT_PLUGIN_PATH=$HOME/.kde4/lib/kde4/plugins/:/usr/lib/kde4/plugins/
 
  export QT_PLUGIN_PATH=$HOME/.kde4/lib/kde4/plugins/:/usr/lib/kde4/plugins/
  
into your {{ic|/etc/profile}} (or {{ic|~/.profile}} if you do not have root access). qtconfig should then be able to find your kde styles and everything should look nice again!
+
into your {{ic|/etc/profile}} (or {{ic|~/.profile}} if you do not have root access). {{ic|qtconfig-qt4}} should then be able to find your KDE styles and everything should look nice again!
  
 
Alternatively, you can symlink the Qt styles directory to the KDE styles one:
 
Alternatively, you can symlink the Qt styles directory to the KDE styles one:
  # ln -s /usr/lib/kde4/plugins/styles/ /usr/lib/qt/plugins/styles
+
  # ln -s /usr/lib/kde4/plugins/styles/ /usr/lib/qt4/pluginlib32-libdbusmenu-glibs/styles
  
 
Under Gnome you can try to install the package libgnomeui.
 
Under Gnome you can try to install the package libgnomeui.
  
===KDE and Qt programs look bad after upgrade (using kwin)===
+
=== KF5/Qt5 applications don't display icons in i3/fvwm/awesome ===
The problem is caused by old cache. Run the following to rebuild it
+
  
  $ rm ~/.config/Trolltech.conf
+
See [[Qt#Configuration of Qt5 apps under environments other than KDE]].
  $ kbuildsycoca4 --noincremental
+
  
from https://bbs.archlinux.org/viewtopic.php?id=135301
+
=== Graphical related problems ===
 +
 
 +
==== Plasma keeps crashing with legacy Nvidia ====
 +
 
 +
This is caused by a [https://bugs.kde.org/show_bug.cgi?id=348753 bug in Plasma] when using the Nvidia-304xx driver. Rather than disabling compositing, create a file {{ic|kwin.sh}} in {{ic|~/.config/plasma-workspace/env/}} with the following contents:
 +
 
 +
#!/bin/sh
 +
export KWIN_EXPLICIT_SYNC=0
 +
 
 +
Then go to ''system-settings > Startup and Shutdown > Autostart'' and ''Check/Add'' the script as a pre-KDE startup file.
 +
 
 +
==== Applications don't refresh properly ====
 +
 
 +
If you use 3D-accelerated composition with [[Intel]], you might find that the Plasma panel and other applications don't refresh properly (stay frozen). Some Intel drivers have [https://bugzilla.redhat.com/show_bug.cgi?id=1259475 problems with EGL]. Go to System Settings under ''Display and Monitor'' -> ''Compositor''. Set ''OpenGL interface'' to OpenGL 3.1. If that does not work, see [[Intel graphics#SNA issues]] for alternative solutions.
 +
 
 +
==== Low 2D desktop performance (or) artifacts appear when on 2D ====
  
=== Graphical related issues ===
 
==== Low 2D desktop performance (or) Artifacts appear when on 2D ====
 
 
===== GPU driver problem =====
 
===== GPU driver problem =====
 +
 
Make sure you have the proper driver for your card installed, so that your desktop is at least 2D accelerated. Follow these articles for more information: [[ATI]], [[NVIDIA]], [[Intel]] for more information, in order to make sure that everything is all right.
 
Make sure you have the proper driver for your card installed, so that your desktop is at least 2D accelerated. Follow these articles for more information: [[ATI]], [[NVIDIA]], [[Intel]] for more information, in order to make sure that everything is all right.
 
The open-source ATI and Intel drivers and the proprietary (binary) Nvidia driver should theoretically provide the best 2D and 3D acceleration.
 
The open-source ATI and Intel drivers and the proprietary (binary) Nvidia driver should theoretically provide the best 2D and 3D acceleration.
  
 
===== The Raster engine workaround =====
 
===== The Raster engine workaround =====
If this does not solve your problems, maybe your driver does not provide a good '''XRender''' acceleration which the current Qt painter engine relies on by default.  
+
{{Accuracy|xrender is not default in plasma 5. XRender should not be recommended anymore.}}
 +
If this does not solve your problems, your driver may not provide a good '''XRender''' acceleration which the current Qt painter engine relies on by default.
  
You can change the painter engine to software based only by invoking the application with the "'''-graphicssystem raster'''" command line. This rendering engine can be set as the default one by recompiling Qt with the same as configure option, "'''-graphicssystem raster'''".  
+
You can change the painter engine to software based only by invoking the application with the {{ic|-graphicssystem raster}} command line. This rendering engine can be set as the default one by recompiling Qt with the same as configure option, {{ic|-graphicssystem raster}}.
  
 
The raster paint engine enables the CPU to do the majority of the painting, as opposed to the GPU. You may get better performance, depending on your system. This is basically a work-around for the terrible Linux driver stack, since the CPU should obviously not be doing graphical computations since it is designed for fewer threads of greater complexity, as opposed to the GPU which is many threads but lesser computational strength. So, only use Raster engine if you are having problems or your GPU is much slower than you CPU, otherwise is better to use XRender.
 
The raster paint engine enables the CPU to do the majority of the painting, as opposed to the GPU. You may get better performance, depending on your system. This is basically a work-around for the terrible Linux driver stack, since the CPU should obviously not be doing graphical computations since it is designed for fewer threads of greater complexity, as opposed to the GPU which is many threads but lesser computational strength. So, only use Raster engine if you are having problems or your GPU is much slower than you CPU, otherwise is better to use XRender.
  
Since Qt 4.7+, recompiling Qt is not needed. Simply export '''QT_GRAPHICSSYSTEM=raster''', or "opengl", or "native" (for the default). Raster depends on the CPU, OpenGL depends on the GPU and high driver support, and Native is just using the X11 rendering (mixture, usually).
+
Since Qt 4.7+, recompiling Qt is not needed. Simply export {{ic|1=QT_GRAPHICSSYSTEM=raster}}, or {{ic|opengl}}, or {{ic|native}} (for the default). Raster depends on the CPU, OpenGL depends on the GPU and high driver support, and Native is just using the X11 rendering (mixture, usually).
  
'''The best and automatic way to do that''' is to install {{AUR|kcm-qt-graphicssystem}} from AUR and configure this particular Qt setting through
+
'''The best and automatic way to do that''' is to install {{AUR|kcm-qt-graphicssystem}} from AUR and configure this particular Qt setting through ''System Settings > Qt Graphics System''.
  
  System Settings > Qt Graphics System
+
For more information, consult this [http://apachelog.wordpress.com/2010/09/05/qt-graphics-system-kcm/ KDE Developer blog entry] and/or this [https://web.archive.org/web/20100430183745/http://labs.trolltech.com/blogs/2009/12/18/qt-graphics-and-performance-the-raster-engine Qt Developer blog entry].
 
+
For more information, consult this [http://apachelog.wordpress.com/2010/09/05/qt-graphics-system-kcm/ KDE Developer blog entry] and/or this [http://labs.trolltech.com/blogs/2009/12/18/qt-graphics-and-performance-the-raster-engine/ Qt Developer blog entry].
+
  
 
==== Low 3D desktop performance====
 
==== Low 3D desktop performance====
KDE begins with desktop effects enabled.  Older cards may be insufficient for 3D desktop acceleration.  You can disable desktop effects in
 
System Settings -> Desktop Effects
 
or you can toggle desktop effects with {{Keypress|Alt+Shift+F12}}.
 
  
{{Note| You may encounter such problems with 3D desktop performance even when using a more powerful graphics card, but using catalyst proprietary driver (fglrx). This driver is known for having issues with 3D acceleration. Visit [[ATI|the ATi Wiki page]] for more troubleshooting.}}
+
KDE begins with desktop effects enabled. Older cards may be insufficient for 3D desktop acceleration. You can disable desktop effects in ''System Settings > Desktop Effects'' and you can toggle desktop effects with {{ic|Alt+Shift+F12}}.
 +
 
 +
{{Note| You may encounter such problems with 3D desktop performance even when using a more powerful graphics card. Make sure the GPU driver and it's components has been successfully installed.}}
  
 
==== Desktop compositing is disabled on my system with a modern Nvidia GPU ====
 
==== Desktop compositing is disabled on my system with a modern Nvidia GPU ====
Sometimes, KWin may have settings in its configuration file ('''kwinrc''') that ''may'' cause a problem on re-activating the 3D desktop '''OpenGL''' compositing. That could be caused randomly (for example, due to a sudden Xorg crash or restart, and it gets corrupted), so, in case that happens, delete your {{ic|~/.kde4/share/config/kwinrc}} file and relogin. The KWin settings will turn to the KDE default ones and the problem should be probably gone.
+
 
 +
Sometimes, KWin may have settings in its configuration file ({{ic|kwinrc}}) that ''may'' cause a problem on re-activating the 3D desktop {{ic|OpenGL}} compositing. That could be caused randomly (for example, due to a sudden Xorg crash or restart, and it gets corrupted), so, in case that happens, delete your {{ic|~/.kde4/share/config/kwinrc}} file and relogin. The KWin settings will turn to the KDE default ones and the problem should be probably gone.
  
 
==== Flickering in fullscreen when compositing is enabled ====
 
==== Flickering in fullscreen when compositing is enabled ====
As of KDE SC 4.6.0, there is an option in systemsettings -> Desktop Effect -> Advanced -> "Suspend desktop effects for fullscreen windows" Uncheck it would tell kwin to disable unredirect fullscren.
 
  
===Sound problems under KDE===
+
As of KDE SC 4.6.0, there is an option in ''Sytem Settings > Desktop Effect > Advanced > Suspend desktop effects for fullscreen windows''. Uncheck it would tell kwin to disable unredirect fullscren.
====ALSA related problems====
+
{{Note|First make sure you have {{pkg|alsa-lib}} and {{pkg|alsa-utils}} installed.}}
+
  
====="Falling back to default" messages when trying to listen to any sound in KDE=====
+
==== Display settings lost on reboot (multiple monitors) ====
When you encounter such messages:
+
There is a [https://bugs.kde.org/show_bug.cgi?id=346961 bug] in kscreen that makes it forget dual screen settings after reboot with certain displays.
:The audio playback device ''<name-of-the-sound-device>'' does not work.
+
A possible workaround is to uninstall {{Pkg|kscreen}} and specify your screen setup in a xorg.conf file instead:
:Falling back to default
+
* See [[Multihead#RandR]] for using the [[Wikipedia:RandR|RandR]] [[Wikipedia:X Window System|X Window System]] extension.
Go to
+
* For Nouveau you can use the template at [[Nouveau#Dual Head]], just edit it to suit your setup.
System Settings -> Multimedia -> Phonon
+
* For the proprietary nvidia driver you can use the [[NVIDIA#Using_NVIDIA_Settings|nvidia-settings]] utility as root to write the config file.
and set the device named "'''default'''" above all the other devices in each box you see.
+
  
=====I cannot play MP3 files when using the GStreamer Phonon backend=====
+
=== Sound problems under KDE ===
That can be solved by installing the GStreamer plugins (package {{Pkg|gstreamer0.10-plugins}}. If you still encounter problems, you can try changing the Phonon backend used by installing another such as {{Pkg|phonon-vlc}}.
+
Then make sure the backend is preferred via:
+
  System Settings -> Multimedia -> Phonon -> Backend (tab)
+
  
===I want a fresh installation of KDE for my system. What should I do?===
+
==== ALSA related problems ====
Just rename the settings directory of KDE (just in case you will want to go back to your original settings):
+
mv ~/.kde4 ~/.kde4-backup
+
  
===Plasma desktop behaves strangely===
+
{{Note|First make sure you have {{Pkg|alsa-lib}} and {{Pkg|alsa-utils}} installed.}}
Plasma issues are usually caused by unstable '''plasmoids''' or '''plasma themes'''. First, find which was the last plasmoid or plasma theme you had installed and disable it or uninstall it.  
+
  
So, if your desktop suddenly exhibits "locking up", this is likely caused by a faulty installed widget. If you cannot remember which widget you installed before the problem began(sometimes it can be an irregular problem), try to track it down by removing each widget until the problem ceases. Then you can uninstall the widget, and file a bug report (bugs.kde.org) '''only if it is an official widget'''. If it is not, I recommend you find the entry on kde-look.org and inform the developer of that widget about the issue (detailing steps to reproduce, etc).
+
===== "Falling back to default" messages when trying to listen to any sound in KDE =====
  
If you cannot find the problem, but you do not want ''all'' the KDE settings to be lost, do:
+
When you encounter such messages:
 +
The audio playback device ''name_of_the_sound_device'' does not work.
 +
Falling back to default
 +
Go to ''System Settings > Multimedia > Phonon'' and set the device named {{ic|default}} above all the other devices in each box you see.
  
  rm -r ~/.kde4/share/config/plasma*
+
===== MP3 files cannot be played when using the GStreamer Phonon backend =====
  
This command will '''delete all plasma related configs''' of your user and when you will relogin into KDE, you will have the '''default''' settings back. You should know that this action '''cannot be undone'''. You ought to create a backup folder and copy all the plasma related configs in it.
+
This can be solved by installing the GStreamer libav plugin (package {{Pkg|gst-libav}}). If you still encounter problems, you can try changing the Phonon backend used by installing another such as {{Pkg|phonon-qt4-vlc}} or {{Pkg|phonon-qt5-vlc}}.
 +
Then, make sure the backend is preferred via ''System Settings > Multimedia > Phonon > Backend (tab)''.
  
===Konsole does not save commands' history===
+
=== Konsole does not save commands' history ===
By default console commands' history is saved only when you type 'exit' in console. When you close Konsole with 'x' in the corner it does not happen.
+
To enable autosaving after every command execution you should add following lines into your .bashrc
+
shopt -s histappend
+
[[ "${PROMPT_COMMAND}" ]] && PROMPT_COMMAND="$PROMPT_COMMAND;history -a" || PROMPT_COMMAND="history -a"
+
  
===KDE password prompts display three bullets per char===
+
By default console command history is saved only when you type 'exit' in console. When you close Konsole with 'x' in the corner it does not happen.
You can change it under '''System Settings > Account Details'''. At '''Password & User Account''' the options are:
+
To enable autosaving after every command execution:
*Show one bullet for each letter
+
*Show three bullets for each letter
+
*Show nothing
+
  
===Nepomukserver process still autostart even with semantic desktop disabled===
+
{{hc|~/.bashrc|<nowiki>
Go to ''' System Settings > Startup and Shutdown > Service Manager > Startup Services''' and uncheck the Nepomuk Search Module.
+
shopt -s histappend
 +
[[ "${PROMPT_COMMAND}" ]] && PROMPT_COMMAND="$PROMPT_COMMAND;history -a" || PROMPT_COMMAND="history -a"
 +
</nowiki>}}
  
===File Indexer Service not working even after enabling everything properly===
+
=== Inotify folder watch limit ===
Use the following command to find Nepomuk's configuration files.
+
find $HOME/.kde4/share/ -name "*nepomuk*"
+
Delete all files and folders in the output and then restart KDE.
+
  
===Desktop does not respond for several seconds at startup===
+
If you get the following error:
There is a bug in either [https://bugs.freedesktop.org/show_bug.cgi?id=58758 pulseaudio] or [https://bugs.kde.org/show_bug.cgi?id=312560 kde] that makes the desktop not being usable for a few seconds after it has showed up (for example if you click on the K-menu it does not appears until that waiting time has elapsed).
+
  
The workaround is to disable {{ic|/etc/xdg/autostart/pulseaudio.desktop}} by adding the following line at the end (do not omit the semicolon):
+
KDE Baloo Filewatch service reached the inotify folder watch limit. File changes may be ignored.
  
NotShowIn=KDE;
+
Then you will need to increase the inotify folder watch limit:
  
Note that you could also remove that file, or renaming it (to pulseaudio.desktop.disable or the like) but then it will not load in other Desktop Managers, and will be restored by a package update.
+
# echo 10000 > /proc/sys/fs/inotify/max_user_watches
  
'''''Source:''' http://linuxadvantage.blogspot.fr/2013/01/kde-rather-slow-to-start-pulseaudio.html''
+
To make changes permanent, create {{ic|/etc/sysctl.d/90-inotify.conf}} with
  
===KDE Notifications do not go away even after being dismissed===
+
#increase inotify watch limit
This is a known [https://bugs.kde.org/show_bug.cgi?id=311413 bug] filed in December. It has a patch, but there seems to be no target release specified to fix it. [https://bbs.archlinux.org/viewtopic.php?id=160308 This discussion] may be referred to for more details.
+
fs.inotify.max_user_watches = 10000
  
==Other KDE projects==
+
=== Freezes when using Automount on a NFS volume  ===
  
=== Official kde-unstable ===
+
Using [[Fstab#Automount with systemd]] on a [[NFS]] volume may cause freezes, see [https://bugs.kde.org/show_bug.cgi?id=354137 bug report upstream].
When KDE is reaching beta or RC milestone, KDE "unstable" packages are uploaded to the [kde-unstable] repo. They stay there until KDE is declared stable and passes to [extra].
+
  
You may add it by adding:
+
=== Locale warning when installing packages in Konsole ===
  
[kde-unstable]
+
  mandb: can't set the locale; make sure $lc_* and $lang are correct
SigLevel = PackageRequired
+
Include = /etc/pacman.d/mirrorlist
+
  
to {{ic|/etc/pacman.conf}}
+
By default, Konsole sets $LANG to en_US.US-ASCII. If you haven't generated that locale, then mandb can't use it. In your Konsole profile settings, click "Environment" and then add a line for LANG=en_US.UTF-8 or whatever your locale should be.
  
# kde-unstable is based upon testing. Therefore, you need to enable the repositories in the following order: '''kde-unstable, testing, core, extra, community-testing, community'''.
+
=== Multi-monitor issues ===
# To update from a previous KDE installation, run: <code>pacman -Syu</code> or <code>pacman -S kde-unstable/kde</code>
+
# If you don't have KDE installed, you might have difficulties to install it by using groups (limitation of pacman)
+
# '''Subscribe and read the arch-dev-public mailing list'''
+
# Make sure [[#Distro_and_Upstream_bug_report|you make bug reports]] if you find any issues.
+
  
=== Trinity ===
+
The current release of KDE Plasma has several issues with multi-monitor setups, which can make Plasma unusable. See [https://bugs.kde.org/show_bug.cgi?id=356225 KDE Bug 356225].
From the release of KDE 4.x, the developers dropped support for KDE 3.5.x. Trinity Desktop Environment is a fork of KDE3 developed by Timothy Pearson ([http://trinitydesktop.org/ trinitydesktop.org]). This project aims to keep the KDE3.5 computing style alive, as well as polish off any rough edges that were present as of KDE 3.5.10. See [[Trinity]] for more info.
+
  
{{Warning| KDE 3 is no longer maintained and supported by the KDE developers. The "Trinity KDE" is maintained by the Trinity project commmunity. Use KDE 3 on your own risk, regarding any bugs, performance issues or security risks.}}
+
These bugs have been resolved in the upstream/git KDE Plasma builds, which can be installed from {{AUR|plasma-desktop-git}} or {{AUR|plasma-git-meta}} - bear in mind that all packages will conflict with current versions - it is recommended to [[remove]] them first.
  
==Bugs==
+
== Unstable releases ==
===Distro and Upstream bug report===
+
It is preferrable that if you find a minor or serious bug, you should visit [https://bugs.archlinux.org the Arch Bug Tracker] or/and [http://bugs.kde.org KDE Bug Tracker] in order to report that. Make sure that you be clear on what you want to report.
+
  
If you have any issue and you write about in on the Arch forums, first make sure that you have '''FULLY''' updated your system using a good sync mirror (check [https://www.archlinux.de/?page=MirrorStatus here]) or try [[Reflector]].
+
See [[Official repositories#kde-unstable]]
  
KDE 4 config files are usually located at
+
== Bugs ==
  
~/.kde4/share/config/
+
It is preferable that if you find a minor or serious bug, you should visit [https://bugs.archlinux.org the Arch Bug Tracker] or/and [http://bugs.kde.org KDE Bug Tracker] in order to report that. Make sure that you are clear about what you want to report.
  
and for app-specific configs
+
If you have any problem and you write about in on the Arch forums, first make sure that you have '''fully''' updated your system using a good sync mirror (check [https://www.archlinux.de/?page=MirrorStatus here]) or try [[Reflector]].
  
~/.kde4/share/apps/
+
== See also ==
  
==External Links==
+
* [http://www.kde.org KDE homepage]
* [http://www.kde.org KDE Homepage]
+
* [https://bugs.kde.org KDE bug tracker]
* [http://bugs.kde.org KDE Bug Tracker]
+
* [https://projects.kde.org KDE Projects]
* [https://bugs.archlinux.org Arch Linux Bug Tracker]
+
* [http://blog.martin-graesslin.com/blog/kategorien/kde/ Martin Graesslin's blog]
* [http://websvn.kde.org KDE WebSVN]
+

Latest revision as of 11:25, 26 August 2016

KDE is a software project currently comprising of a desktop environment known as Plasma (or Plasma Workspaces), a collection of libraries and frameworks (KDE Frameworks) and several applications (KDE Applications) as well. KDE upstream has a well maintained UserBase wiki. Detailed information about most KDE applications can be found there.

Contents

Installation

Plasma Desktop

Note:
  • Plasma 5 is not co-installable with Plasma 4.
  • The Plasma 4 desktop is unmaintained since August 2015.[1] It is no longer in the official repositories since December 2015.[2]
  • KDM is no longer available for Plasma 5. KDE upstream recommends using the SDDM display manager as it provides integration with the Plasma 5 theme.

Before installing Plasma, make sure you have a working Xorg installation on your system.

Install the plasma-meta meta-package or the plasma group. For differences between plasma-meta and plasma reference Creating packages#Meta packages and groups. Alternatively, for a more minimal Plasma installation, install the plasma-desktop package.

Upgrading from Plasma 4 to 5

  1. Isolate multi-user.target:
    # systemctl isolate multi-user.target
  2. If you use KDM as display manager, disable the kdm.service systemd unit.
  3. Uninstall the kdebase-workspaceAUR package.
  4. Install the plasma-meta package or the plasma group.
  5. Enable the sddm.service systemd unit, or install and enable any other display manager.
  6. Reboot or simply start the systemd sddm.service unit.
Note: The Plasma 4 configuration is not automatically migrated to Plasma 5, so you will have to configure your desktop from scratch.

KDE applications and language packs

To install the full set of KDE Applications, install the kde-applications group or the kde-applications-meta meta-package. Note that this will only install applications, it will not install any version of the Plasma Desktop.

If you need language files, install kde-l10n-yourlanguagehere (e.g. kde-l10n-de for the German language). For a full list of available languages see this link.

Starting Plasma

Tip: To better integrate SDDM with Plasma, it is recommended to edit /etc/sddm.conf to use the breeze theme. Refer to SDDM#Theme settings for instructions.

To launch a Plasma 5 session, choose Plasma in your display manager menu.

Alternatively, to start Plasma with startx, append exec startkde to your .xinitrc file. If you want to start Xorg at login, please see Start X at login.

Wayland

As of Plasma 5.6, Plasma on Wayland should be usable but still buggy.[3] Multi-monitor support is broken.

  • To start a Plasma on Wayland session from a display manager, install the plasma-wayland-session package and Plasma should show up in the display manager.
  • To start a Plasma on Wayland session from a console, run startplasmacompositor.

Configuration

Most settings for KDE applications are stored in ~/.config, but some older applications may use ~/.kde4. However, configuring KDE is primarily done through the System Settings application. It can be started from a terminal by executing systemsettings5.

Frameworks 5 applications can use KDE 4 configuration however they expect the configuration files to be located in different places. To allow Frameworks 5 applications running in KDE 4 to share the same configurations they may be moved to the new locations and symlinked back to the old. Examples are:

  • Konsole profiles from ~/.kde4/share/apps/konsole to ~/.local/share/konsole/
  • Application appearance from ~/.kde4/share/config/kdeglobals to ~/.config/kdeglobals

Personalization

Plasma desktop

Themes
Note: If the Plasma cursor theme is incorrect in some instances, see the following forum post for a workaround.

Plasma themes define the look of panels and plasmoids. For easy system-wide installation, some such themes are available in both the official repositories and the AUR.

The easiest way to install themes is by going through the Desktop Settings control panel:

 Workspace Theme > Desktop Theme > Get new Themes

This will present a nice frontend for kde-look.org that allows you to install, uninstall, or update third-party plasmoid scripts with literally just one click.

Splash and Lock screens are currently unavailable so to customize these screens you have to modify the original theme found in /usr/share/plasma/look-and-feel/. See this thread on the Kubuntu forums.

Note that the SDDM login screen is not part of this theme.

Qt and GTK+ Applications Appearance
Tip: For Qt and GTK theme consistency, see Uniform look for Qt and GTK applications.
Qt4

For Qt4 applications to have a consistent appearance, there are two options: Install breeze-kde4 and then pick Breeze as GUI Style in qtconfig-qt4; or install breeze-gtk and pick GTK+ as GUI Style.

GTK+

The recommended theme for a pleasant appearance in GTK+ applications is breeze-gtk or gnome-breeze-gitAUR, a GTK+ theme designed to mimic the appearance of Plasma 5 Breeze. Install kde-gtk-config and select the installed GTK-theme for GTK2/GTK3-Theme in System Settings > Application Style > GNOME Application Style.

In some themes, tooltips in GTK+ applications have white text on white backgrounds making it difficult to read. To change the colors in GTK2 applications, find the section for tooltips in the gtkrc file and change it. For GTK3 application two files need to be changed, gtk.css and settings.ini.

Widgets

Plasmoids are little scripted (plasmoid scripts) or coded (plasmoid binaries) KDE applications designed to enhance the functionality of your desktop.

Plasmoid binaries can be installed using PKGBUILDs from AUR, or you can write your own PKGBUILD.

The easiest way to install plasmoid scripts is by right-clicking onto a panel or the desktop and choosing Add Widgets > Get new Widgets > Download Widgets.

This will present a nice frontend for kde-look.org that allows you to install, uninstall, or update third-party plasmoid scripts with literally just one click.

Most plasmoids are not created officially by KDE developers. You can also try installing Mac OS X widgets, Microsoft Windows Vista/7 widgets, Google Widgets, and even SuperKaramba widgets.

Sound applet in the system tray

Install plasma-pa or kmix (start Kmix from the Application Launcher).

Note: To adjust the step size of volume increments/decrements, add e.g. VolumePercentageStep=1 in the [Global] section of ~/.kde4/share/config/kmixrc
Disable panel shadow

As the plasma panel is on top of other windows, its shadow is drawn over them. [4] To disable this behaviour without impacting other shadows, install xorg-xprop and run:

$ xprop -remove _KDE_NET_WM_SHADOW

then select the panel with the plus-sized cursor. [5] For automation, install xorg-xwininfo and create the following script:

/usr/local/bin/kde-no-shadow
#!/bin/bash
for WID in $(xwininfo -root -tree | sed '/"Plasma": ("plasmashell" "plasmashell")/!d; s/^  *\([^ ]*\) .*/\1/g'); do
   xprop -id $WID -remove _KDE_NET_WM_SHADOW
done

The script can be run on login with Add Script in Autostart:

$ kcmshell5 autostart

Window decorations

Window decorations can be changed in System Settings > Workspace Appearance > Window Decorations.

There you can also directly download and install more themes with one click, and some are available in the AUR.

Icon themes

Icon themes can be installed and changed on System Settings > Icons.

Note: Although all modern Linux desktops share the same icon theme format, desktops like GNOME use fewer icons (esp. in menus and toolbars). Themes developed for such desktops usually lack icons required by Plasma 5 and KDE apps.
It is recommended to install Plasma compatible icon themes instead.

Fonts

Fonts in a Plasma session look poor

Try installing the ttf-dejavu and ttf-liberation packages.

After the installation, be sure to log out and back in. You should not have to modify anything in System Settings > Fonts.

If you have personally set up how your Fonts render, be aware that System Settings may alter their appearance. When you go System Settings > Appearance > Fonts System Settings will likely alter your font configuration file (fonts.conf).

There is no way to prevent this, but, if you set the values to match your fonts.conf file, the expected font rendering will return (it will require you to restart your application or in a few cases restart your desktop). Note that Gnome's Font Preferences also does this.

Fonts are huge or seem disproportional

Try to force font DPI to 96 in System Settings > Application Appearance > Fonts.

If that does not work, try setting the DPI directly in your Xorg configuration as documented here.

Space efficiency

The Plasma Netbook shell has been dropped from Plasma 5, see the following KDE forum post However, you can achieve something similar by editing the file ~/.config/kwinrc adding BorderlessMaximizedWindows=true in the [Windows] section.

Printing

Tip: Use the CUPS web interface for faster configuration. Printers configured in this way can be used in KDE applications.

You can also configure printers in System Settings > Printer Configuration. To use this method, you must first install print-manager and cups.

The avahi-daemon.service and org.cups.cupsd.service daemons must be started first; otherwise, you will get the following error:

The service 'Printer Configuration' does not provide an interface 'KCModule'
with keyword 'system-config- printer-kde/system-config-printer-kde.py'
The factory does not support creating components of the specified type.

If you are getting the following error, you need to give your user the right to manage printers.

There was an error during CUPS operation: 'cups-authorization-canceled'

For CUPS, this is set in /etc/cups/cups-files.conf.

Adding lpadmin to /etc/group and then to the SystemGroup directive in /etc/cups/cups-files.conf allows anyone in the lpadmin group to configure printers. Do not add the lp group to the SystemGroup directive, or printing will fail.

# groupadd -g107 lpadmin
/etc/cups/cups-files.conf
# Administrator user group...
SystemGroup sys root lpadmin
Tip: Read CUPS#Configuration to get more details on how to configure CUPS.

Samba/Windows support

If you want to have access to Windows services, install Samba (package samba).

The Dolphin share functionality requires usershares, which the stock smb.conf does not have enabled. Instructions to add them are in Samba#Creating usershare path, after which sharing in Dolphin should work out of the box after restarting Samba.

KDE Desktop activities

KDE Desktop Activities are Plasma-based virtual-desktop-like sets of Plasma Widgets where you can independently configure widgets as if you have more than one screen or desktop.

On your desktop, click the Cashew Plasmoid and, on the pop-up window, press "Activities".

A plasma bar presenting you the current existing Plasma Desktop Activities will appear at the bottom of the screen. You can navigate between them by pressing the correspondent icons.

Power saving

Plasma has an integrated power saving service called "Powerdevil Power Management" that may adjust the power saving profile of the system and/or the brightness of the screen (if supported).

Tango-inaccurate.pngThe factual accuracy of this article or section is disputed.Tango-inaccurate.png

Reason: Regarding the note below, it might be that the problem is the logind setting LidSwitchIgnoreInhibited which defaults to yes. [6] (Discuss in Talk:KDE#)
Note: Powerdevil may not inhibit all logind settings (such as the lid close action for laptops). In these cases, the logind setting itself will need to be changed - see Power management#Power management with systemd.

Monitoring changes on local files and directories

KDE now uses inotify directly from the kernel with kdirwatch (included in kdelibs), so Gamin or FAM are no longer needed. You may want to install this kdirwatchAUR[broken link: archived in aur-mirror] from AUR which is a GUI frontend for kdirwatch.

Autostarting applications

Plasma can autostart applications and run scripts on startup and shutdown. To autostart an application, start systemsettings and navigate to Startup and Shutdown -> Autostart and add the program or shell script of your choice. For applications, a .desktop file will be created, for shell scripts, a symlink will be created.

Note:
  • Programs can be autostarted on login only, whilst shell scripts can also be run on shutdown or even before Plasma itself starts.
  • Shell scripts will only be run if they are marked executable.

Place Desktop entries (i.e. .desktop files) here:

~/.config/autostart
for starting applications at login.

Place or symlink shell scripts in one of the following directories:

~/.config/plasma-workspace/env
for executing scripts at login before launching Plasma.
~/.config/autostart-scripts
for executing scripts at login.
~/.config/plasma-workspace/shutdown
for executing scripts on shutdown.

System administration

Terminate Xorg server through KDE System Settings

Navigate to the submenu System Settings > Input Devices > Keyboard > Advanced (tab) > "Key Sequence to kill the X server" and ensure that the checkbox is ticked.

KCM

KCM stands for KConfig Module. KCMs can help you configure your system by providing interfaces in System Settings, or through the command line with kcmshell5.

Configuration for look and feel of GTK applications.

Configuration for the GRUB bootloader.

Configuration for the Uncomplicated Firewall (UFW)

Configuration for PolicyKit

Configuration for Wacom tablets

Configuration for systemd

More KCMs can be found at kde-apps.org.

Desktop search

KDE implements desktop search with a software called Baloo, a file indexing and searching solution.

Baloo

Using and configuring Baloo

In order to search using Baloo on the KDE Plasma Desktop, press ALT+F2 and type in your query. Within Dolphin press CTRL+F.

By default the Desktop Search KCM exposes only two options: A panel to blacklist folders and a way to disable it with one click.

Alternatively you can edit your ~/.config/baloofilerc file (info). Additionally the balooctl process can also be used. In order to disable Baloo run balooctl disable.

Once you added additional folders to the blacklist or disabled Baloo entirely, a process named baloo_file_cleaner removes all unneeded index files automatically. They are stored under ~/.local/share/baloo/.

More advanced configuration options are available through kcm_baloo_advancedAUR[broken link: archived in aur-mirror].

How do I index a removable device?

By default every removable device is blacklisted. You just have to remove your device from the blacklist in the KCM panel.

Web browsers

Konqueror and Rekonq

Konqueror supports two rendering engines – KHTML and QtWebKit (via the kwebkitpart package) – Rekonq supports only QtWebKit. KHTML development was halted after Qt shipped WebKit but was kept for compatibility reasons. QtWebKit, in turn, has since been deprecated by the Qt Project and replaced by Chromium-based Qt WebEngine which is currently not supported by either Konqueror or Rekonq.

A successor named Fiber is currently in development, which will use Chromium's engine.

Firefox

Firefox can be configured to better integrate with Plasma. See Firefox KDE integration for details.

Qupzilla

Qupzilla (qupzilla) is a Qt web browser with Plasma integration features. Qupzilla 2.0 will use Qt WebEngine intead of WebKit.

PIM

KDE offers its own stack for personal information management. This includes emails, contacts, calendar, etc.

Akonadi

Akonadi is a system meant to act as a local cache for PIM data, regardless of its origin, which can be then used by other applications. This includes the user's emails, contacts, calendars, events, journals, alarms, notes, and so on.

Akonadi does not store any data by itself: the storage format depends on the nature of the data (for example, contacts may be stored in vCard format).

Disabling Akonadi

See this section in the KDE userbase.

Database configuration

Start akonaditray from package kdepim-runtime. Right click on it and select configure. In the Akonadi server configure tab, you can:

  • Configuring Akonadi to use MySQL/MariaDB Server
    • If your home directory is on a ZFS pool, you will need to create ~/.config/akonadi/mysql-local.conf with the following contents:
[mysqld]
innodb_use_native_aio = 0

Otherwise you will get the OS error 22

  • Configuring Akonadi to use PostgreSQL Server
  • Configuring Akonadi to use SQLite
    • Edit ~/.config/akonadi/akonadiserverrc to match the below
[General]
Driver=QSQLITE3

[QSQLITE3]
Name=/home/username/.local/akonadi/akonadi.db

Phonon

From Wikipedia:

“Phonon is the multimedia API provided by KDE and is the standard abstraction for handling multimedia streams within KDE software and also used by several Qt applications.

Phonon was originally created to allow KDE and Qt software to be independent of any single multimedia framework such as GStreamer or xine and to provide a stable API for a major version's lifetime.”

Phonon is being widely used within KDE, for both audio (e.g., the System notifications or KDE audio apps) and video (e.g., the Dolphin video thumbnails).

Which backend should I choose?

You can choose between backends based on GStreamer and VLC – each available in versions for Qt4 applications and Qt5 applications (phonon-qt4-gstreamer, phonon-qt5-gstreamerphonon-qt4-vlc, phonon-qt5-vlc).

Upstream prefers VLC but prominent Linux distributions (Kubuntu and Fedora-KDE for example) prefer GStreamer because that allows them to easily leave out patented MPEG codecs from the default installation. Both backends have a slightly different features set.

In the past other backends were developed as well but are no longer maintained and their AUR packages have been deleted.

Note:
  • Multiple backends can be installed at once and prioritized at System Settings > Multimedia > Phonon > Backend. For Plasma 5 this would be System Settings > Multimedia > Backend.
  • According to the KDE forums, the VLC backend lacks support for ReplayGain.

Useful applications

The official set of KDE applications may be found here.

Yakuake

Yakuake provides a Quake-like terminal emulator whose visibility is toggled by the F12 key. It also has support for multiple tabs. Yakuake is available in the package yakuake.

KDE Telepathy

KDE Telepathy is a project with the goal to closely integrate Instant Messaging with the KDE desktop. It utilizes the Telepathy framework as a backend and is intended to replace Kopete.

To install all Telepathy protocols, install the telepathy group. To use the KDE Telepathy client, install the telepathy-kde-meta package that includes all the packages contained in the telepathy-kde group.

Use Telegram with KDE Telepathy

Telegram protocol is available using telepathy-haze, installing telegram-purpleAUR or telegram-purple-gitAUR and telepathy-morse-gitAUR. The username is the Telegram account telephone number (complete with the national prefix '+xx', e.g. '+49' for Germany). The configuration through the GUI may be tricky: if the phone number is not accepted when configuring a new account in the KDE Telepathy client (with an error message complaining about an invalid parameter which prevents the account creation), insert it between single quotes and then remove the quotes manually from the configuration file (~/.local/share/telepathy/mission-control/accounts.cfg) after the account creation (if the quotes are not removed after, an authentication error should rise). Note that the configuration file should be edited manually when KDE Telepathy is not running, e.g. when there is no KDE desktop session active, otherwise manual changes may be overwritten by the software.

Tips and tricks

Using an alternative window manager

There may be reasons you want to use another window manager than KWin, for example to work around the DRI bug that causes black screen with PRIME.

To use an alternative window manager with Plasma open the System Settings panel, navigate to (Default) Applications > Window Manager > Use a different window manager and select the window manager you wish to use from the list.

KDE/Openbox session

The openbox package provides a session for using KDE with Openbox. To make use of this session, select KDE/Openbox from the display manager menu.

For those starting the session manually, add the following line to your .xinitrc file:

exec openbox-kde-session

Compiz custom

If you need to run Compiz with custom options and switches select Compiz custom and then create a script called compiz-kde-launcher and add to it the commands you wish to use to start Compiz. See the example below:

/usr/local/bin/compiz-kde-launcher
#!/bin/bash
LIBGL_ALWAYS_INDIRECT=1
compiz --replace &
wait

Then make it executable:

$ chmod +x /usr/local/bin/compiz-kde-launcher

Re-enabling compositing effects

When replacing Kwin with a window manager which does not provide a Compositor (such as Openbox), any desktop compositing effects e.g. transparency will be lost. In this case, install and run a separate Composite manager to provide the effects such as Xcompmgr or Compton.

Integrate Android

KDE Connect provides several features for you:

  • Share files and URLs to/from KDE from/to any app, without wires.
  • Touchpad emulation: Use your phone screen as your computer's touchpad.
  • Notifications sync (4.3+): Read your Android notifications from the desktop.
  • Shared clipboard: copy and paste between your phone and your computer.
  • Multimedia remote control: Use your phone as a remote for Linux media players.
  • WiFi connection: no usb wire or bluetooth needed.
  • RSA Encryption: your information is safe.

You will need to install KDE Connect both on your computer and on your Android. For PC side, install kdeconnect package. For Android side, install KDE Connect from Google Play or from F-Droid.

Configure KWin to use OpenGL ES

Set environment variable KWIN_COMPOSE to 'O2ES' to force the OpenGL ES backend. Please note that OpenGL ES is not supported by all drivers.

Speed up application startup

User Rob described a "magic trick" on his blog to improve application start-up time by 50-150ms. To enable it, create this folder in your home:

$ mkdir ~/.compose-cache/

It can produce freezes under heavy io. To avoid this, also do:

$ ln -sfv /run/user/$UID/ /home/$USER/.compose-cache
Note: For those curious about what is going on here, this enables an optimization which Lubos (of general KDE speediness fame) came up with some time ago and was then rewritten and integrated into libx11. Ordinarily, on startup, applications read input method information from /usr/share/X11/locale/your locale/Compose. This file is quite long (>5000 lines for the en_US.UTF-8 one) and takes some time to process. libX11 can create a cache of the parsed information which is much quicker to read subsequently, but it will only re-use an existing cache or create a new one in ~/.compose-cache if the directory already exists.

Configuring monitor resolution / multiple monitors

To enable display resolution management and multiple monitors in Plasma 5, install kscreen. This adds the additional options to System Settings/Display and Monitor.

Open application launcher with Super key (Windows key)

Install and start ksuperkey. Now assign Alt + F1 as hot key. The Super Key will now open the application launcher. You can add ksuperkey to the autostart if you don't want to start it manually.

Troubleshooting

Configuration related

Many problems in KDE are related to configuration.

Plasma desktop behaves strangely

Plasma problems are usually caused by unstable Plasma widgets (colloquially called plasmoids) or Plasma themes. First, find which was the last widget or theme you had installed and disable it or uninstall it.

So, if your desktop suddenly exhibits "locking up", this is likely caused by a faulty installed widget. If you cannot remember which widget you installed before the problem began (sometimes it can be an irregular problem), try to track it down by removing each widget until the problem ceases. Then you can uninstall the widget, and file a bug report (bugs.kde.org) only if it is an official widget. If it is not, it is recommended you find the entry on kde-look.org and inform the developer of that widget about the problem (detailing steps to reproduce, etc).

If you cannot find the problem, but you do not want all the settings to be lost, navigate to ~/.config:

$ for j in plasma*; do mv -- "$j" "${j%}.bak"; done

This command will rename all Plasma related configs to *.bak (e.g. plasmarc.bak) of your user and when you will relogin into Plasma, you will have the default settings back. To undo that action, remove the .bak file extension. If you already have *.bak files, rename, move, or delete them first. It is highly recommended that you create regular backups anyway. See Synchronization and backup programs for a list of possible solutions.

Clean cache to resolve upgrade problems

The problem may be caused by old cache. Sometimes after an upgrade, the old cache might introduce strange, hard to debug behaviour such as unkillable shells, hangs when changing various settings and several other problems such as ark being unable to unrar or unzip or amarok not recognizing any of your music. This solution can also resolve problems with KDE and Qt programmes looking bad following upgrade.

Rebuild your cache with the following commands:

$ rm ~/.config/Trolltech.conf
$ kbuildsycoca4 --noincremental

Hopefully, your problems are now fixed.

Clean akonadi configuration to fix KMail

First, make sure that KMail is not running. Then backup configuration:

$ mv ~/.local/share/akonadi ~/.local/share/akonadi-old
$ mv ~/.config/akonadi ~/.config/akonadi-old

Start SystemSettings > Personal and remove all the resources. Go back to Dolphin and remove the original ~/.local/share/akonadi and ~/.config/akonadi - the copies you made ensure that you can back-track if necessary.

Now go back to the System Settings page and carefully add the necessary resources. You should see the resource reading in your mail folders. Then start Kontact/KMail to see if it work properly.

Fix empty IMAP inbox

For some IMAP accounts, kmail will show the inbox as a container with all other folders of this account inside. Kmail does not show messages in the inbox container but in all other subfolders [7]. To solve this problem simply disable the server side subscribition in the kmail account settings.

Getting current state of KWin for support and debug purposes

This command prints out a wonderful summary of the current state of KWin including used options, used compositing backend and relevant OpenGL driver capabilities. See more on Martin's blog.

$ qdbus org.kde.kwin /KWin supportInformation

KDE and Qt programs look bad when in a different window manager

If you are using KDE or Qt programs but not in a full Plasma session (specifically, you did not run startkde), then as of Plasma 4.6.1 you will need to tell Qt how to find KDE's styles (Oxygen, QtCurve etc.)

You just need to set the environment variable QT_PLUGIN_PATH. E.g. put:

export QT_PLUGIN_PATH=$HOME/.kde4/lib/kde4/plugins/:/usr/lib/kde4/plugins/

into your /etc/profile (or ~/.profile if you do not have root access). qtconfig-qt4 should then be able to find your KDE styles and everything should look nice again!

Alternatively, you can symlink the Qt styles directory to the KDE styles one:

# ln -s /usr/lib/kde4/plugins/styles/ /usr/lib/qt4/pluginlib32-libdbusmenu-glibs/styles

Under Gnome you can try to install the package libgnomeui.

KF5/Qt5 applications don't display icons in i3/fvwm/awesome

See Qt#Configuration of Qt5 apps under environments other than KDE.

Graphical related problems

Plasma keeps crashing with legacy Nvidia

This is caused by a bug in Plasma when using the Nvidia-304xx driver. Rather than disabling compositing, create a file kwin.sh in ~/.config/plasma-workspace/env/ with the following contents:

#!/bin/sh
export KWIN_EXPLICIT_SYNC=0

Then go to system-settings > Startup and Shutdown > Autostart and Check/Add the script as a pre-KDE startup file.

Applications don't refresh properly

If you use 3D-accelerated composition with Intel, you might find that the Plasma panel and other applications don't refresh properly (stay frozen). Some Intel drivers have problems with EGL. Go to System Settings under Display and Monitor -> Compositor. Set OpenGL interface to OpenGL 3.1. If that does not work, see Intel graphics#SNA issues for alternative solutions.

Low 2D desktop performance (or) artifacts appear when on 2D

GPU driver problem

Make sure you have the proper driver for your card installed, so that your desktop is at least 2D accelerated. Follow these articles for more information: ATI, NVIDIA, Intel for more information, in order to make sure that everything is all right. The open-source ATI and Intel drivers and the proprietary (binary) Nvidia driver should theoretically provide the best 2D and 3D acceleration.

The Raster engine workaround

Tango-inaccurate.pngThe factual accuracy of this article or section is disputed.Tango-inaccurate.png

Reason: xrender is not default in plasma 5. XRender should not be recommended anymore. (Discuss in Talk:KDE#)

If this does not solve your problems, your driver may not provide a good XRender acceleration which the current Qt painter engine relies on by default.

You can change the painter engine to software based only by invoking the application with the -graphicssystem raster command line. This rendering engine can be set as the default one by recompiling Qt with the same as configure option, -graphicssystem raster.

The raster paint engine enables the CPU to do the majority of the painting, as opposed to the GPU. You may get better performance, depending on your system. This is basically a work-around for the terrible Linux driver stack, since the CPU should obviously not be doing graphical computations since it is designed for fewer threads of greater complexity, as opposed to the GPU which is many threads but lesser computational strength. So, only use Raster engine if you are having problems or your GPU is much slower than you CPU, otherwise is better to use XRender.

Since Qt 4.7+, recompiling Qt is not needed. Simply export QT_GRAPHICSSYSTEM=raster, or opengl, or native (for the default). Raster depends on the CPU, OpenGL depends on the GPU and high driver support, and Native is just using the X11 rendering (mixture, usually).

The best and automatic way to do that is to install kcm-qt-graphicssystemAUR from AUR and configure this particular Qt setting through System Settings > Qt Graphics System.

For more information, consult this KDE Developer blog entry and/or this Qt Developer blog entry.

Low 3D desktop performance

KDE begins with desktop effects enabled. Older cards may be insufficient for 3D desktop acceleration. You can disable desktop effects in System Settings > Desktop Effects and you can toggle desktop effects with Alt+Shift+F12.

Note: You may encounter such problems with 3D desktop performance even when using a more powerful graphics card. Make sure the GPU driver and it's components has been successfully installed.

Desktop compositing is disabled on my system with a modern Nvidia GPU

Sometimes, KWin may have settings in its configuration file (kwinrc) that may cause a problem on re-activating the 3D desktop OpenGL compositing. That could be caused randomly (for example, due to a sudden Xorg crash or restart, and it gets corrupted), so, in case that happens, delete your ~/.kde4/share/config/kwinrc file and relogin. The KWin settings will turn to the KDE default ones and the problem should be probably gone.

Flickering in fullscreen when compositing is enabled

As of KDE SC 4.6.0, there is an option in Sytem Settings > Desktop Effect > Advanced > Suspend desktop effects for fullscreen windows. Uncheck it would tell kwin to disable unredirect fullscren.

Display settings lost on reboot (multiple monitors)

There is a bug in kscreen that makes it forget dual screen settings after reboot with certain displays. A possible workaround is to uninstall kscreen and specify your screen setup in a xorg.conf file instead:

Sound problems under KDE

ALSA related problems

Note: First make sure you have alsa-lib and alsa-utils installed.
"Falling back to default" messages when trying to listen to any sound in KDE

When you encounter such messages:

The audio playback device name_of_the_sound_device does not work.
Falling back to default

Go to System Settings > Multimedia > Phonon and set the device named default above all the other devices in each box you see.

MP3 files cannot be played when using the GStreamer Phonon backend

This can be solved by installing the GStreamer libav plugin (package gst-libav). If you still encounter problems, you can try changing the Phonon backend used by installing another such as phonon-qt4-vlc or phonon-qt5-vlc. Then, make sure the backend is preferred via System Settings > Multimedia > Phonon > Backend (tab).

Konsole does not save commands' history

By default console command history is saved only when you type 'exit' in console. When you close Konsole with 'x' in the corner it does not happen. To enable autosaving after every command execution:

~/.bashrc
shopt -s histappend
[[ "${PROMPT_COMMAND}" ]] && PROMPT_COMMAND="$PROMPT_COMMAND;history -a" || PROMPT_COMMAND="history -a"

Inotify folder watch limit

If you get the following error:

KDE Baloo Filewatch service reached the inotify folder watch limit. File changes may be ignored.

Then you will need to increase the inotify folder watch limit:

# echo 10000 > /proc/sys/fs/inotify/max_user_watches

To make changes permanent, create /etc/sysctl.d/90-inotify.conf with

#increase inotify watch limit
fs.inotify.max_user_watches = 10000

Freezes when using Automount on a NFS volume

Using Fstab#Automount with systemd on a NFS volume may cause freezes, see bug report upstream.

Locale warning when installing packages in Konsole

 mandb: can't set the locale; make sure $lc_* and $lang are correct

By default, Konsole sets $LANG to en_US.US-ASCII. If you haven't generated that locale, then mandb can't use it. In your Konsole profile settings, click "Environment" and then add a line for LANG=en_US.UTF-8 or whatever your locale should be.

Multi-monitor issues

The current release of KDE Plasma has several issues with multi-monitor setups, which can make Plasma unusable. See KDE Bug 356225.

These bugs have been resolved in the upstream/git KDE Plasma builds, which can be installed from plasma-desktop-gitAUR or plasma-git-metaAUR - bear in mind that all packages will conflict with current versions - it is recommended to remove them first.

Unstable releases

See Official repositories#kde-unstable

Bugs

It is preferable that if you find a minor or serious bug, you should visit the Arch Bug Tracker or/and KDE Bug Tracker in order to report that. Make sure that you are clear about what you want to report.

If you have any problem and you write about in on the Arch forums, first make sure that you have fully updated your system using a good sync mirror (check here) or try Reflector.

See also